HDU3047 Zjnu Stadium (带权并查集)
作者:互联网
经典的向量法,只要找出数学关系就行了
#include<iostream> #include<algorithm> #include<string> #include<cstring> #include<vector> #include<cstdio> #include<map> using namespace std; const int N=1e5+10; int n,m; int p[N]; int d[N]; int find(int x){ if(x!=p[x]){ int t=p[x]; p[x]=find(p[x]); d[x]=(d[x]+d[t])%300; } return p[x]; } int main(){ while(cin>>n>>m){ int i; memset(d,0,sizeof d); int num=0; for(i=1;i<=n;i++) p[i]=i; for(i=1;i<=m;i++){ int x,a,b; scanf("%d%d%d",&a,&b,&x); int pa=find(a),pb=find(b); if(pa==pb){ if(((d[a]-d[b])%300+300)%300!=(-x+300)%300) num++; } else{ p[pa]=pb; d[pa]=((-d[a]-x+d[b])%300+300)%300; } } cout<<num<<endl; } }View Code
标签:memset,num,int,查集,HDU3047,带权,include,find 来源: https://www.cnblogs.com/ctyakwf/p/12409973.html