제출 #4920

#제출 시각아이디문제언어결과실행 시간메모리
4920gs13068비용 (KOI11_cost)C++98
1.20 / 24
52 ms3432 KiB
#include<cstdio> #include<algorithm> int parent[100001]; int height[100001]; int size[100001]; long long res; int root(int x){return x==parent[x]?x:parent[x]=root(parent[x]);} inline void combine(int a,int b,int c) { a=root(a); b=root(b); if(a==b)(res+=1LL*size[a]*(size[a]-1)/2*c)%=1000000000; else if(a!=b) { (res+=1LL*(size[a]+size[b])*(size[a]+size[b]-1)/2*c)%=1000000000; if(height[a]<height[b]) { parent[a]=b; size[b]+=size[a]; } else { parent[b]=a; size[a]+=size[b]; } if(height[a]==height[b]) height[a]++; } } struct edge { int s; int e; int t; } a[100000]; inline bool operator <(const edge &x,const edge &y) { return x.t>y.t; } int main() { int i,n,m; scanf("%d%d",&n,&m); for(i=1;i<=n;i++) { parent[i]=i; size[i]=1; } for(i=0;i<m;i++)scanf("%d%d%d",&a[i].s,&a[i].e,&a[i].t); std::sort(a,a+m); for(i=0;i<m;i++)combine(a[i].s,a[i].e,a[i].t); printf("%lld\n",res); }
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