P2648 赚钱https://www.luogu.com.cn/problem/P2648

#include <iostream>
#include <cstdio>
#include <string>
#include <algorithm>
#include <vector>
#include <queue>
#include <stack>
#include <cstring>
#include <set>
#include <cmath>
#include <map>
#include <cstdlib>
typedef long long ll;
typedef unsigned long long ull;
using namespace std;
const int MN = 65005;
const int MAXN = 1000010;
const int INF = 0x3f3f3f3f;
#define IOS ios::sync_with_stdio(false)
#define lowbit(x) ((x)&(-x))

int D, P, C, F;
int s[355][355], d[355], v[355], cnt[355];


inline void Floyd() {
	for (int k = 1; k <= C; k++) {
		for (int i = 1; i <= C; i++) {
			for (int j = 1; j <= C; j++) {
				s[i][j] = max(s[i][j], s[i][k] + s[k][j]);
			}
		}
	}
}

int main() {
	memset(s, 0xc0, sizeof(s));
	int x, y, c;
	scanf("%d %d %d %d", &D, &P, &C, &F);
	for (int i = 1; i <= P; i++) {
		scanf("%d %d", &x, &y);
		s[x][y] = D;
	}
	for (int i = 1; i <= F; i++) {
		scanf("%d %d %d", &x, &y, &c);
		s[x][y] = D - c;
	}
	Floyd();
	int ans1 = 0;
	int ans2 = 0;
	for (int i = 1; i <= C; i++) {
		for (int j = 1; j <= C; j++) {
			ans1 = max(ans1, s[i][j]);
		}
	}
	Floyd();
	for (int i = 1; i <= C; i++) {
		for (int j = 1; j <= C; j++) {
			ans2 = max(ans2, s[i][j]);
		}
	}
	//printf("%d", ans1 + D);
	if (ans1 != ans2) {
		printf("orz");
	} else {
		printf("%d", ans1 + D);
	}
	return 0;
}



#if 0
int D, P, C, F;
int head[MAXN];
int nxt[MAXN];
int ver[MAXN];
int cost[MAXN];
int cnt;
int rec[MAXN];
int d[MAXN];
inline void add(int x, int y, int c) {
	ver[++cnt] = y;
	nxt[cnt] = head[x];
	cost[cnt] = c;
	head[x] = cnt;
}
bool vis[MAXN];

inline bool spfa(int s) {
	memset(vis, 0, sizeof(vis));
	memset(rec, 0, sizeof(rec));
	memset(d, 128, sizeof(d));
	queue<int> que;
	que.push(s);
	d[s] = 0;
	vis[s] = true;
	while (!que.empty()) {
		int x = que.front();
		que.pop();
		vis[x] = false;
		for (int i = head[x]; i; i = nxt[i]) {
			int y = ver[i], c = cost[i];
			if (d[y] > d[x] + c) {
				d[y] = d[x] + c;
				rec[y] = rec[x] + 1;
				if (rec[y] > C) {
					return true;
				}
				if (!vis[y]) {
					que.push(y);
					vis[y] = true;
				}
			}
		}
	}
	return false;
}

int main() {
	int x, y, c;
	scanf("%d %d %d %d", &D, &P, &C, &F);
	for (int i = 1; i <= P; i++) {
		scanf("%d %d", &x, &y);
		add(x, y, -D);
	}
	for (int i = 1; i <= F; i++) {
		scanf("%d %d %d", &x, &y, &c);
		add(x, y, c - D);
	}
	int ans = 0;
	for (int i = 1; i <= C; i++) {
		if (spfa(i)) {
			printf("orz");
			return 0;
		} else {
			for (int i = 1; i <= C; i++) {
				ans = max(ans, -d[i]);
			}
		}
	}
	printf("%d", ans + D);
	return 0;
}
#endif