Submission #400365

#	Time	Username	Problem	Language	Result	Execution time	Memory
400365		nikatamliani	Bitaro’s Party (JOI18_bitaro)	C++14	14 / 100	2090 ms	14788 KiB

bitaro

#include <bits/stdc++.h>
using namespace std;
void maxi(int &x, int y) {
	if(x < y) x = y;
}
int main() {
	ios::sync_with_stdio(0); cin.tie(0);
	const int C = 1005;
	int n, m, q;
	cin >> n >> m >> q;
	vector<vector<int>> g(n+1);
	vector<vector<int>> r(n+1);
	for(int i = 1; i <= m; ++i) {
		int u, v; cin >> u >> v;
		g[u].push_back(v);
		r[v].push_back(u);
	}
	vector<bool> blocked(n+1);
	while(q--) {
		int t, x; cin >> t >> x;
		vector<int> v(x);
		for(int i = 0; i < x; ++i) {
			cin >> v[i]; 
			blocked[v[i]] = 1;
		}
		vector<int> dp(n+1, -1e6);
		for(int i = 1; i <= t; ++i) {
			if(!blocked[i]) {
				dp[i] = 0;
			}
			for(int x : r[i]) {
				maxi(dp[i], dp[x]+1);
			}
		}
		if(dp[t] < 0) {
			dp[t] = -1;
		}
		cout << dp[t] << '\n';
		for(int i : v) blocked[i] = 0;
	}
}

Compilation message (stderr)

bitaro.cpp: In function 'int main()':
bitaro.cpp:8:12: warning: unused variable 'C' [-Wunused-variable]
    8 |  const int C = 1005;
      |            ^

• Subtask 1: 7 / 7
• Subtask 2: 7 / 7
• Subtask 3: 0 / 86