제출 #944

#제출 시각아이디문제언어결과실행 시간메모리
944testtest비용 (KOI11_cost)C++98
24 / 24
54 ms3228 KiB
#include<stdio.h> #include<algorithm> #define V_ 100000 #define E_ 100000 #define INF 1000000000 typedef unsigned long long lld; int V, E; struct S1{ int a, b, v; bool operator < (const S1 &t) const { return v > t.v; } }G[E_+1]; int Sum [E_+1]; int group[V_+1], cnt[V_+1]; int find_group (int node){ if(group[node] == node) return node; return group[node] = find_group(group[node]); } lld res; int main(){ int i, j; scanf("%d%d",&V,&E); for(i=1; i<=E; i++) scanf("%d%d%d",&G[i].a,&G[i].b,&G[i].v); std::sort(G+1, G+E+1); for(i=1; i<=V; i++) group[i] = i, cnt[i] = 1; Sum[E] = G[E].v; for(i=E-1; i>0; i--) Sum[i] = (Sum[i+1] + G[i].v)%INF; for(i=1; i<=E; i++){ int a = find_group(G[i].a), b = find_group(G[i].b); if(a != b){ res = (res + (lld)cnt[a] * cnt[b] * Sum[i]) % INF; cnt[a] += cnt[b]; group[b] = a; cnt[b] = 0; } } printf("%llu\n",res); return 0; } //
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