#双指针#洛谷 7405 [JOI 2021 Final] 雪玉
作者:互联网
分析
无论怎样刮风,雪球的相对位置不会改变,
实际上每一个空段都由左右两个雪球瓜分(边界空段除外),
那么按照空段长度从小到大排序,用双指针找到恰好第一个未瓜分的位置
代码
#include <cstdio>
#include <cctype>
#include <queue>
#include <algorithm>
#define rr register
using namespace std;
typedef long long lll; const int N=200011;
lll n,Q,lst,a[N],ans[N],rk[N],west[N],step[N],east[N];
inline lll iut(){
rr lll ans=0,f=1; rr char c=getchar();
while (!isdigit(c)) f=(c=='-')?-f:f,c=getchar();
while (isdigit(c)) ans=(ans<<3)+(ans<<1)+(c^48),c=getchar();
return ans*f;
}
inline void print(lll ans){
if (ans>9) print(ans/10);
putchar(ans%10+48);
}
bool cmp(int x,int y){return a[x]<a[y];}
signed main(){
n=iut()-1,Q=iut(),lst=iut();
for (rr int i=1;i<=n;++i)
a[i]=iut()-lst,lst+=a[i],rk[i]=i;
sort(rk+1,rk+1+n,cmp),lst=0;
for (rr int i=1;i<=Q;++i){
step[i]=iut(),lst+=step[i];
if (lst<0) west[i]=max(west[i-1],-lst);
else west[i]=west[i-1];
if (lst>0) east[i]=max(east[i-1],lst);
else east[i]=east[i-1];
}
ans[1]+=west[Q],ans[n+1]+=east[Q];
for (rr int i=1,j=1;i<=n;++i){
for (;j<=Q&&west[j]+east[j]<a[rk[i]];++j);
if (j>Q){
for (rr int o=i;o<=n;++o)
ans[rk[o]]+=east[Q],ans[rk[o]+1]+=west[Q];
break;
}
ans[rk[i]]+=east[j-1],ans[rk[i]+1]+=west[j-1];
ans[rk[i]+(step[j]<0)]+=a[rk[i]]-west[j-1]-east[j-1];
}
for (rr int i=1;i<=n+1;++i)
print(ans[i]),putchar(10);
return 0;
}
标签:include,洛谷,rr,int,lll,雪玉,ans,east,2021 来源: https://www.cnblogs.com/Spare-No-Effort/p/15423189.html