Submission #692881

#	Time	Username	Problem	Language	Result	Execution time	Memory
692881		penguin133	Travelling Merchant (APIO17_merchant)	C++17	100 / 100	84 ms	5036 KiB

merchant

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define pi pair<int, int>
#define pii pair<int, pi>
#define fi first
#define se second
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif

int B[105][10005], S[105][10005], adj[105][105], prof[105][105], n, m, kk, adj2[105][105];
void solve(){
	cin >> n >> m >> kk;
	for(int i=1;i<=n;i++)for(int j=1;j<=n;j++)adj[i][j] = 1e18, adj[i][i] = 0;
	for(int i=1;i<=n;i++){
		for(int j=1;j<=kk;j++)cin >> B[i][j] >> S[i][j];
	}
	while(m--){
		int x, y, z; cin >> x >> y >> z;
		adj[x][y] = min(adj[x][y], z);
	}
	for(int k=1;k<=n;k++)for(int i=1;i<=n;i++)for(int j=1;j<=n;j++)adj[i][j] = min(adj[i][j], adj[i][k] + adj[k][j]);
	for(int i=1;i<=n;i++)for(int j=1;j<=n;j++){
		for(int k=1;k<=kk;k++)if(B[i][k] != -1 && S[j][k] != -1)prof[i][j] = max(prof[i][j], S[j][k] - B[i][k]);
	}
	int lo = 1, hi = 1e9, ans = 0;
	while(lo <= hi){
		int mid = (lo + hi) >> 1;
		for(int i=1;i<=n;i++)for(int j=1;j<=n;j++)adj2[i][j] = 1e18;
		for(int i=1;i<=n;i++)for(int j=1;j<=n;j++)if(i != j && adj[i][j] != 1e18)adj2[i][j] = min(adj2[i][j], mid * adj[i][j] - prof[i][j]);
		for(int k=1;k<=n;k++)for(int i=1;i<=n;i++)for(int j=1;j<=n;j++)adj2[i][j] = min(adj2[i][j], adj2[i][k] + adj2[k][j]);
		bool f = 0;
		for(int i=1;i<=n;i++)if(adj2[i][i] <= 0)f = 1;
		if(f)ans = mid, lo = mid + 1;
		else hi = mid - 1;
	}
	cout << ans;
}

main(){
	ios::sync_with_stdio(0);cin.tie(0);
	int tc = 1;
	//cin >> tc;
	for(int tc1=1;tc1<=tc;tc1++){
		// cout << "Case #" << tc1 << ": ";
		solve();
	}
}

Compilation message (stderr)

merchant.cpp:42:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   42 | main(){
      | ^~~~

• Subtask 1: 12 / 12
• Subtask 2: 21 / 21
• Subtask 3: 33 / 33
• Subtask 4: 34 / 34