Submission #771317

#	Time	Username	Problem	Language	Result	Execution time	Memory
771317		pera	Bosses (BOI16_bosses)	C++17	0 / 100	5 ms	8168 KiB

bosses

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

#define int long long

const int N = 2e5 + 1;

int n , ans , c;
vector<int> g[N] , v(N) , d(N);

void dfs(int u){
	v[u] = 1;
	c += d[u];
	for(int i = 0;i < g[u].size();i ++){
		if(!v[g[u][i]]){
			d[g[u][i]] = d[u] + 1;
			dfs(g[u][i]);
		}
	}
}

main(){
	ios::sync_with_stdio(0);
	cin.tie(0),cout.tie(0);
	cin >> n;
	for(int i = 1;i <= n;i ++){
		int k;cin >> k;
		for(int j = 1;j <= k;j ++){
			int v;cin >> v;
			g[v].push_back(i);
		}
	}
	ans = INT_MAX;
	for(int boss = 1;boss <= n;boss ++){
		for(int i = 1;i <= n;i ++){
			d[i] = v[i] = 0;
		}
		c = 0;
		d[boss] = 1;
		dfs(boss);
		if(accumulate(v.begin() , v.end() , 0) == n) ans = min(ans , c);
	}
	cout << ans << endl;
}

Compilation message (stderr)

bosses.cpp: In function 'void dfs(long long int)':
bosses.cpp:14:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |  for(int i = 0;i < g[u].size();i ++){
      |                ~~^~~~~~~~~~~~~
bosses.cpp: At global scope:
bosses.cpp:22:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   22 | main(){
      | ^~~~

• Subtask 1: 0 / 22
• Subtask 2: 0 / 45
• Subtask 3: 0 / 33