HDU-3038-How Many Answers Are Wrong
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HDU-3038-How Many Answers Are Wrong
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鏈接:https://vjudge.net/problem/HDU-3038#author=0
題意:
給出N和M
有M次記錄,以l,r,v給出,表示l-r區間和為v問,有多少是錯誤的答案。
思路:
帶權并查集。
sum[i] 表示i到F[i]的和。
代碼:
#include <iostream> #include <memory.h> #include <string> #include <istream> #include <sstream> #include <vector> #include <stack> #include <algorithm> #include <map> #include <queue> #include <math.h> using namespace std; const int MAXN = 500086; int Father[MAXN]; int Sum[MAXN];int Get_F(int x) {if (x == Father[x])return x;int tmp = Father[x];Father[x] = Get_F(Father[x]);Sum[x] += Sum[tmp];return Father[x]; }int main() {int n,m;//while (scanf("%d%d",&n,&m))while (cin >> n >> m){for (int i = 0; i <= n; i++)Father[i] = i;memset(Sum, 0, sizeof(Sum));int l, r, v;int cnt = 0;for (int i = 1; i <= m; i++){scanf("%d%d%d", &l, &r, &v);l--;int tl = Get_F(l);int tr = Get_F(r);if (tl != tr){Father[tl] = tr;Sum[tl] = Sum[r] + v - Sum[l];}else{if (Sum[l] - Sum[r] != v)cnt++;}}printf("%d\n", cnt);}return 0; }
轉載于:https://www.cnblogs.com/YDDDD/p/10300726.html
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