2018-2019 ACM-ICPC, China Multi-Provincial Collegiate Programming Contest
作者:互联网
宁夏邀请赛的题,网络赛出锅之后来补了一下,还蛮有意思。题目地址:https://codeforces.com/gym/102222
A、给你一个栈和一堆pop、push操作,每次操作之后询问栈中的最大值,如果栈为空输出0
输入是给定的一个随机数生成器
每一次有元素进栈就把他与当前最大值比较,更新最大值之后把最大值压入另一个栈,pop时两个栈同时操作,每次输出另一个栈的栈顶即可
(这就是单调栈?)
代码:
#include <bits/stdc++.h> using namespace std; typedef long long ll; int t,n,p,q,m,Case=1; unsigned int SA,SB,SC; stack<unsigned int> mx; ll ans; unsigned int rng61(){ SA^=SA<<16; SA^=SA>>5; SA^=SA<<1; unsigned int t=SA; SA=SB; SB=SC; SC^=t^SA; return SC; } void Push(unsigned int v){ if(mx.empty()) mx.push(v); else mx.push(max(mx.top(),v)); } void Pop(){ if(mx.empty()) return; mx.pop(); } void gen(){ ans=0; scanf("%d%d%d%d%u%u%u",&n,&p,&q,&m,&SA,&SB,&SC); while(!mx.empty()) mx.pop(); for(int i=1;i<=n;++i){ if(rng61()%(p+q)<p) Push(rng61()%m+1); else Pop(); if(!mx.empty()) ans^=((ll)i*mx.top()); } printf("Case #%d: %lld\n",Case,ans); } int main(){ scanf("%d",&t); for(;Case<=t;++Case) gen(); return 0; }
B、给定一个多边形,一开始p[0]到p[1]这条边在一条直线上,然后不断逆时针旋转多边形使得p[i]到p[i+1]这条边落到直线上
当p[0]到p[1]再次落到直线上时停止旋转
问你多边形内的一个点在这个过程中走了多长
假设每一次旋转的弧度为alpha,画个图就能看出来alpha等于pi减去当前线段与下一条线段的夹角,用余弦定理算夹角就完事
如图:
代码:
#include <bits/stdc++.h> #define int long long #define sc(a) scanf("%lld",&a) #define scc(a,b) scanf("%lld %lld",&a,&b) #define sccc(a,b,c) scanf("%lld %lld %lld",&a,&b,&c) #define schar(a) scanf("%c",&a) #define pr(a) printf("%lld",a) #define fo(i,a,b) for(int i=a;i<b;++i) #define re(i,a,b) for(int i=a;i<=b;++i) #define rfo(i,a,b) for(int i=a;i>b;--i) #define rre(i,a,b) for(int i=a;i>=b;--i) #define prn() printf("\n") #define prs() printf(" ") #define mkp make_pair #define pii pair<int,int> #define pub(a) push_back(a) #define pob() pop_back() #define puf(a) push_front(a) #define pof() pop_front() #define fst first #define snd second #define frt front() #define bak back() #define mem0(a) memset(a,0,sizeof(a)) #define memmx(a) memset(a,0x3f3f,sizeof(a)) #define memmn(a) memset(a,-0x3f3f,sizeof(a)) #define debug #define db double #define yyes cout<<"YES"<<endl; #define nno cout<<"NO"<<endl; using namespace std; typedef vector<int> vei; typedef vector<pii> vep; typedef map<int,int> mpii; typedef map<char,int> mpci; typedef map<string,int> mpsi; typedef deque<int> deqi; typedef deque<char> deqc; typedef priority_queue<int> mxpq; typedef priority_queue<int,vector<int>,greater<int> > mnpq; typedef priority_queue<pii> mxpqii; typedef priority_queue<pii,vector<pii>,greater<pii> > mnpqii; const int maxn=500005; const int inf=0x3f3f3f3f3f3f3f3f; const int MOD=100000007; const db eps=1e-10; const db pi=3.1415926535; int qpow(int a,int b){int tmp=a%MOD,ans=1;while(b){if(b&1){ans*=tmp,ans%=MOD;}tmp*=tmp,tmp%=MOD,b>>=1;}return ans;} int lowbit(int x){return x&-x;} int max(int a,int b){return a>b?a:b;} int min(int a,int b){return a<b?a:b;} int mmax(int a,int b,int c){return max(a,max(b,c));} int mmin(int a,int b,int c){return min(a,min(b,c));} void mod(int &a){a+=MOD;a%=MOD;} bool chk(int now){} int half(int l,int r){while(l<=r){int m=(l+r)/2;if(chk(m))r=m-1;else l=m+1;}return l;} int ll(int p){return p<<1;} int rr(int p){return p<<1|1;} int mm(int l,int r){return (l+r)/2;} int lg(int x){if(x==0) return 1;return (int)log2(x)+1;} bool smleql(db a,db b){if(a<b||fabs(a-b)<=eps)return true;return false;} db len(db a,db b,db c,db d){return sqrt((a-c)*(a-c)+(b-d)*(b-d));} bool isp(int x){if(x==1)return false;if(x==2)return true;for(int i=2;i*i<=x;++i)if(x%i==0)return false;return true;} int t,n,Case=1; struct point{ db x,y; }p[maxn],q; db len(point a,point b){ return sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y)); } signed main(){ ios_base::sync_with_stdio(0); cin.tie(0),cout.tie(0); sc(t); for(;Case<=t;++Case){ db ans=0.0; sc(n); re(i,0,n-1) scanf("%lf%lf",&p[i].x,&p[i].y); p[n]=p[0],p[n+1]=p[1]; scanf("%lf%lf",&q.x,&q.y); re(i,1,n){ db a=len(p[i-1],p[i]); db b=len(p[i],p[i+1]); db c=len(p[i-1],p[i+1]); db alpha=acos((a*a+b*b-c*c)/(2.0*a*b)); alpha=pi-alpha; ans+=alpha*len(q,p[i]); } printf("Case #%d: ",Case,ans); printf("%.3lf\n",ans); } return 0; }
C、给你三个小写字母字符串,第二个字符串是由第一个字符串的每一位加n再对26取余得到的
要求求出n,然后把第三个字符串每一位减n加26再对26取余,输出结果
按照题意搞就行
代码:
#include <bits/stdc++.h> #define int long long #define sc(a) scanf("%lld",&a) #define scc(a,b) scanf("%lld %lld",&a,&b) #define sccc(a,b,c) scanf("%lld %lld %lld",&a,&b,&c) #define schar(a) scanf("%c",&a) #define pr(a) printf("%lld",a) #define fo(i,a,b) for(int i=a;i<b;++i) #define re(i,a,b) for(int i=a;i<=b;++i) #define rfo(i,a,b) for(int i=a;i>b;--i) #define rre(i,a,b) for(int i=a;i>=b;--i) #define prn() printf("\n") #define prs() printf(" ") #define mkp make_pair #define pii pair<int,int> #define pub(a) push_back(a) #define pob() pop_back() #define puf(a) push_front(a) #define pof() pop_front() #define fst first #define snd second #define frt front() #define bak back() #define mem0(a) memset(a,0,sizeof(a)) #define memmx(a) memset(a,0x3f3f,sizeof(a)) #define memmn(a) memset(a,-0x3f3f,sizeof(a)) #define debug #define db double #define yyes cout<<"YES"<<endl; #define nno cout<<"NO"<<endl; using namespace std; typedef vector<int> vei; typedef vector<pii> vep; typedef map<int,int> mpii; typedef map<char,int> mpci; typedef map<string,int> mpsi; typedef deque<int> deqi; typedef deque<char> deqc; typedef priority_queue<int> mxpq; typedef priority_queue<int,vector<int>,greater<int> > mnpq; typedef priority_queue<pii> mxpqii; typedef priority_queue<pii,vector<pii>,greater<pii> > mnpqii; const int maxn=500005; const int inf=0x3f3f3f3f3f3f3f3f; const int MOD=100000007; const db eps=1e-10; int qpow(int a,int b){int tmp=a%MOD,ans=1;while(b){if(b&1){ans*=tmp,ans%=MOD;}tmp*=tmp,tmp%=MOD,b>>=1;}return ans;} int lowbit(int x){return x&-x;} int max(int a,int b){return a>b?a:b;} int min(int a,int b){return a<b?a:b;} int mmax(int a,int b,int c){return max(a,max(b,c));} int mmin(int a,int b,int c){return min(a,min(b,c));} void mod(int &a){a+=MOD;a%=MOD;} bool chk(int now){} int half(int l,int r){while(l<=r){int m=(l+r)/2;if(chk(m))r=m-1;else l=m+1;}return l;} int ll(int p){return p<<1;} int rr(int p){return p<<1|1;} int mm(int l,int r){return (l+r)/2;} int lg(int x){if(x==0) return 1;return (int)log2(x)+1;} bool smleql(db a,db b){if(a<b||fabs(a-b)<=eps)return true;return false;} db len(db a,db b,db c,db d){return sqrt((a-c)*(a-c)+(b-d)*(b-d));} bool isp(int x){if(x==1)return false;if(x==2)return true;for(int i=2;i*i<=x;++i)if(x%i==0)return false;return true;} int t,n,m; string s1,s2,s3; signed main(){ ios_base::sync_with_stdio(0); cin.tie(0),cout.tie(0); cin>>t; re(jj,1,t){ cin>>n>>m; cin>>s1>>s2>>s3; int dif=s2[0]-s1[0]; fo(i,0,m){ s3[i]=(s3[i]-'A'-dif+26)%26+'A'; } cout<<"Case #"<<jj<<": "<<s3<<endl; } return 0; }
H、n只怪物,你对每只怪物的伤害是1、2、3、4,意味着每一次攻击怪物,你对这只怪物的伤害就会增加1
每攻击一次,所有存活的怪物都会对你造成伤害,现在你要挑选一个合适的攻击顺序,使得自己受到的伤害最小
首先考虑对单只怪物,一定要把它打倒再打下一只才更优,应当尽快减少怪物的数量
考虑经典的贪心策略,假设怪物a排在怪物b前面,那么应当满足下面的条件:
杀死怪物a的时间*(怪物a、b的攻击力)+(杀死怪物a、b的时间)*怪物b的攻击力
小于
杀死怪物b的时间*(怪物a、b的攻击力)+(杀死怪物a、b的时间)*怪物a的攻击力
写个排序函数搞一下完事。
代码:
#include <bits/stdc++.h> #define int long long #define sc(a) scanf("%lld",&a) #define scc(a,b) scanf("%lld %lld",&a,&b) #define sccc(a,b,c) scanf("%lld %lld %lld",&a,&b,&c) #define schar(a) scanf("%c",&a) #define pr(a) printf("%lld",a) #define fo(i,a,b) for(int i=a;i<b;++i) #define re(i,a,b) for(int i=a;i<=b;++i) #define rfo(i,a,b) for(int i=a;i>b;--i) #define rre(i,a,b) for(int i=a;i>=b;--i) #define prn() printf("\n") #define prs() printf(" ") #define mkp make_pair #define pii pair<int,int> #define pub(a) push_back(a) #define pob() pop_back() #define puf(a) push_front(a) #define pof() pop_front() #define fst first #define snd second #define frt front() #define bak back() #define mem0(a) memset(a,0,sizeof(a)) #define memmx(a) memset(a,0x3f3f,sizeof(a)) #define memmn(a) memset(a,-0x3f3f,sizeof(a)) #define debug #define db double #define yyes cout<<"YES"<<endl; #define nno cout<<"NO"<<endl; using namespace std; typedef vector<int> vei; typedef vector<pii> vep; typedef map<int,int> mpii; typedef map<char,int> mpci; typedef map<string,int> mpsi; typedef deque<int> deqi; typedef deque<char> deqc; typedef priority_queue<int> mxpq; typedef priority_queue<int,vector<int>,greater<int> > mnpq; typedef priority_queue<pii> mxpqii; typedef priority_queue<pii,vector<pii>,greater<pii> > mnpqii; const int maxn=500005; const int inf=0x3f3f3f3f3f3f3f3f; const int MOD=100000007; const db eps=1e-10; int qpow(int a,int b){int tmp=a%MOD,ans=1;while(b){if(b&1){ans*=tmp,ans%=MOD;}tmp*=tmp,tmp%=MOD,b>>=1;}return ans;} int lowbit(int x){return x&-x;} int max(int a,int b){return a>b?a:b;} int min(int a,int b){return a<b?a:b;} int mmax(int a,int b,int c){return max(a,max(b,c));} int mmin(int a,int b,int c){return min(a,min(b,c));} void mod(int &a){a+=MOD;a%=MOD;} bool chk(int now){} int half(int l,int r){while(l<=r){int m=(l+r)/2;if(chk(m))r=m-1;else l=m+1;}return l;} int ll(int p){return p<<1;} int rr(int p){return p<<1|1;} int mm(int l,int r){return (l+r)/2;} int lg(int x){if(x==0) return 1;return (int)log2(x)+1;} bool smleql(db a,db b){if(a<b||fabs(a-b)<=eps)return true;return false;} db len(db a,db b,db c,db d){return sqrt((a-c)*(a-c)+(b-d)*(b-d));} bool isp(int x){if(x==1)return false;if(x==2)return true;for(int i=2;i*i<=x;++i)if(x%i==0)return false;return true;} int t,n; int Case=1; vei v; struct node{ int hp,atk; }o[maxn]; bool cmp(node a,node b){ int p1=lower_bound(v.begin(),v.end(),a.hp)-v.begin()+1; int p2=lower_bound(v.begin(),v.end(),b.hp)-v.begin()+1; return a.atk*p1+b.atk*(p1+p2)<b.atk*p2+a.atk*(p1+p2); } signed main(){ ios_base::sync_with_stdio(0); cin.tie(0),cout.tie(0); sc(t); re(i,1,10000) v.pub((1+i)*i/2); for(;Case<=t;++Case){ int ans=0,sum=0; sc(n); re(i,1,n) scc(o[i].hp,o[i].atk),sum+=o[i].atk; sort(o+1,o+1+n,cmp); re(i,1,n){ int p=lower_bound(v.begin(),v.end(),o[i].hp)-v.begin()+1; ans+=sum*p; sum-=o[i].atk; } printf("Case #%lld: %lld\n",Case,ans); } return 0; }
D、题意比较抽象
先说第一小问,n个人上飞机,第i个人本来应该坐在第i个位置
现在第一个人票丢了,他会随机选择一个座位
从第二个人开始,如果他本来的位置上没人,他就会坐本来的位置,否则他也会随机选择一个座位
第一问是问第n个人坐到本来的位置的概率是多少
不妨假设f(x)表示x个人时候的答案
考虑只有一个人的情况:
他必定坐回一号位,概率为1.0,即f(1)=1
考虑只有两个人的情况:
如果第一个人坐了一号位,第二人必坐二号位;如果第一个人坐了二号位,那么第二人必坐一号位,概率为0.5,f(2)=0.5
接下来考虑f(3):
如果第一个人坐了一号位,概率为1.0
如果第一个人坐了二号位,相当于第二个人变成了第一个人,概率为f(2)
如果第一个人坐了三号位,无论如何最后一个人也不会坐回原来的位置,概率为0
所以f(3)=1*1/3+f(2)*1/3+0*1/3=0.5
实际上对于任意的f(x),f(x)=1*1/x+f(2)*1/x+...+f(x-1)*1/x+0*1/x=0.5
这意味着第一个人坐到哪个位置上了,那么答案就等于f(从那个位置开始的人数)
第二问是说上飞机顺序随机,意味着不一定第一个人没票
考虑没票的人在第几个位置上飞机,如果他在最后一个位置上飞机,概率为1,否则为0.5
剩下的人上机顺序按照全排列搞就完事了,一共有m!种方案
式子列出来大概长这样:
1*(m-1)!+0.5*(m-1)*(m-1)! / m!
化简得出答案是(m+1)/2*m
代码:
#include <bits/stdc++.h> #define int long long #define sc(a) scanf("%lld",&a) #define scc(a,b) scanf("%lld %lld",&a,&b) #define sccc(a,b,c) scanf("%lld %lld %lld",&a,&b,&c) #define schar(a) scanf("%c",&a) #define pr(a) printf("%lld",a) #define fo(i,a,b) for(int i=a;i<b;++i) #define re(i,a,b) for(int i=a;i<=b;++i) #define rfo(i,a,b) for(int i=a;i>b;--i) #define rre(i,a,b) for(int i=a;i>=b;--i) #define prn() printf("\n") #define prs() printf(" ") #define mkp make_pair #define pii pair<int,int> #define pub(a) push_back(a) #define pob() pop_back() #define puf(a) push_front(a) #define pof() pop_front() #define fst first #define snd second #define frt front() #define bak back() #define mem0(a) memset(a,0,sizeof(a)) #define memmx(a) memset(a,0x3f3f,sizeof(a)) #define memmn(a) memset(a,-0x3f3f,sizeof(a)) #define debug #define db double #define yyes cout<<"YES"<<endl; #define nno cout<<"NO"<<endl; using namespace std; typedef vector<int> vei; typedef vector<pii> vep; typedef map<int,int> mpii; typedef map<char,int> mpci; typedef map<string,int> mpsi; typedef deque<int> deqi; typedef deque<char> deqc; typedef priority_queue<int> mxpq; typedef priority_queue<int,vector<int>,greater<int> > mnpq; typedef priority_queue<pii> mxpqii; typedef priority_queue<pii,vector<pii>,greater<pii> > mnpqii; const int maxn=500005; const int inf=0x3f3f3f3f3f3f3f3f; const int MOD=100000007; const db eps=1e-10; int qpow(int a,int b){int tmp=a%MOD,ans=1;while(b){if(b&1){ans*=tmp,ans%=MOD;}tmp*=tmp,tmp%=MOD,b>>=1;}return ans;} int lowbit(int x){return x&-x;} int max(int a,int b){return a>b?a:b;} int min(int a,int b){return a<b?a:b;} int mmax(int a,int b,int c){return max(a,max(b,c));} int mmin(int a,int b,int c){return min(a,min(b,c));} void mod(int &a){a+=MOD;a%=MOD;} bool chk(int now){} int half(int l,int r){while(l<=r){int m=(l+r)/2;if(chk(m))r=m-1;else l=m+1;}return l;} int ll(int p){return p<<1;} int rr(int p){return p<<1|1;} int mm(int l,int r){return (l+r)/2;} int lg(int x){if(x==0) return 1;return (int)log2(x)+1;} bool smleql(db a,db b){if(a<b||fabs(a-b)<=eps)return true;return false;} db len(db a,db b,db c,db d){return sqrt((a-c)*(a-c)+(b-d)*(b-d));} bool isp(int x){if(x==1)return false;if(x==2)return true;for(int i=2;i*i<=x;++i)if(x%i==0)return false;return true;} int t,Case=1,n,m; signed main(){ ios_base::sync_with_stdio(0); cin.tie(0),cout.tie(0); sc(t); for(;Case<=t;++Case){ db ansa,ansb; scc(n,m); if(n==1) ansa=1.0; else ansa=0.5; if(m==1) ansb=1.0; else ansb=(m+1.0)/(2.0*m); printf("Case #%d: ",Case); printf("%.6lf %.6lf\n",ansa,ansb); } return 0; }
F、点有点权,边有边权,无向图,q个询问,每次询问从u到v的不经过点权大于w的点的最短路径长度(u和v的点权不考虑在内)
数据以邻接矩阵的形式给出,保证自己到自己的距离为0
首先任意两点一定是可达的,直接从起点走到终点完事,起点终点的点权都可以忽略
接下来考虑到n<200,估计floyd可以搞一搞
假设dp[k][i][j]表示在经过前k个点权最小的点的情况下,i到j的最短距离
那么先要把点权离散化一下,找到每个点对应点权的排名,ord[i]代表排名为i的点原来的编号,用pair按照第一维排序就行
对于每个询问,二分找到小于等于它的最大点权对应点的排名,输出dp[排名][x][y]即可
考虑转移方程:
dp[k][i][j]=min(dp[k-1][i][j],dp[k-1][i][mid]+dp[k-1][mid][j]);
其中mid代表排名为k的点编号,实际上也很好理解,对每个点枚举它做为中点,更新答案,只不过floyd起到了保存不同版本的最短路的作用罢了
并且dp[0][i][j]就代表原本两点间的距离
别忘了对原来的r数组排个序,否则二分的时候会出锅
代码:
#include <bits/stdc++.h> #define int long long #define sc(a) scanf("%lld",&a) #define scc(a,b) scanf("%lld %lld",&a,&b) #define sccc(a,b,c) scanf("%lld %lld %lld",&a,&b,&c) #define schar(a) scanf("%c",&a) #define pr(a) printf("%lld",a) #define fo(i,a,b) for(int i=a;i<b;++i) #define re(i,a,b) for(int i=a;i<=b;++i) #define rfo(i,a,b) for(int i=a;i>b;--i) #define rre(i,a,b) for(int i=a;i>=b;--i) #define prn() printf("\n") #define prs() printf(" ") #define mkp make_pair #define pii pair<int,int> #define pub(a) push_back(a) #define pob() pop_back() #define puf(a) push_front(a) #define pof() pop_front() #define fst first #define snd second #define frt front() #define bak back() #define mem0(a) memset(a,0,sizeof(a)) #define memmx(a) memset(a,0x3f3f,sizeof(a)) #define memmn(a) memset(a,-0x3f3f,sizeof(a)) #define debug #define db double #define yyes cout<<"YES"<<endl; #define nno cout<<"NO"<<endl; using namespace std; typedef vector<int> vei; typedef vector<pii> vep; typedef map<int,int> mpii; typedef map<char,int> mpci; typedef map<string,int> mpsi; typedef deque<int> deqi; typedef deque<char> deqc; typedef priority_queue<int> mxpq; typedef priority_queue<int,vector<int>,greater<int> > mnpq; typedef priority_queue<pii> mxpqii; typedef priority_queue<pii,vector<pii>,greater<pii> > mnpqii; const int maxn=500005; const int inf=0x3f3f3f3f3f3f3f3f; const int MOD=100000007; const db eps=1e-10; int qpow(int a,int b){int tmp=a%MOD,ans=1;while(b){if(b&1){ans*=tmp,ans%=MOD;}tmp*=tmp,tmp%=MOD,b>>=1;}return ans;} int lowbit(int x){return x&-x;} int max(int a,int b){return a>b?a:b;} int min(int a,int b){return a<b?a:b;} int mmax(int a,int b,int c){return max(a,max(b,c));} int mmin(int a,int b,int c){return min(a,min(b,c));} void mod(int &a){a+=MOD;a%=MOD;} bool chk(int now){} int half(int l,int r){while(l<=r){int m=(l+r)/2;if(chk(m))r=m-1;else l=m+1;}return l;} int ll(int p){return p<<1;} int rr(int p){return p<<1|1;} int mm(int l,int r){return (l+r)/2;} int lg(int x){if(x==0) return 1;return (int)log2(x)+1;} bool smleql(db a,db b){if(a<b||fabs(a-b)<=eps)return true;return false;} db len(db a,db b,db c,db d){return sqrt((a-c)*(a-c)+(b-d)*(b-d));} bool isp(int x){if(x==1)return false;if(x==2)return true;for(int i=2;i*i<=x;++i)if(x%i==0)return false;return true;} int t,n,q,x,y,w; int r[205],ord[205]; int dp[205][205][205]; vector<pii> v; void floyd(){ re(k,1,n){ int mid=ord[k]; re(i,1,n){ re(j,1,n){ dp[k][i][j]=min(dp[k-1][i][j], dp[k-1][i][mid]+dp[k-1][mid][j]); } } } } signed main(){ ios_base::sync_with_stdio(0); cin.tie(0),cout.tie(0); cin>>t; re(Case,1,t){ cin>>n>>q; v.clear(); memmx(dp); re(i,1,n) cin>>r[i],v.pub(mkp(r[i],i)); re(i,1,n) re(j,1,n) cin>>dp[0][i][j]; sort(v.begin(),v.end()); sort(r+1,r+1+n); re(i,1,n) ord[i]=v[i-1].snd; floyd(); cout<<"Case #"<<Case<<":\n"; while(q--){ cin>>x>>y>>w; int p=upper_bound(r+1,r+1+n,w)-r; p--; cout<<dp[p][x][y]<<endl; } } return 0; }
标签:Provincial,Multi,const,Contest,int,typedef,queue,lld,define 来源: https://www.cnblogs.com/oneman233/p/11475234.html