Submission #859400

#	Time	Username	Problem	Language	Result	Execution time	Memory
859400		iskhakkutbilim	Graph (BOI20_graph)	C++17	0 / 100	2 ms	7516 KiB

Graph

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

#define int long long
#define ff first
#define ss second
#define all(a) a.begin(), a.end()
const int N = 2e5;

int n, m;
vector< pair<int, long double> > g[N+10];
int used[N+10];
long double cost[N+10];
long double sum;
void dfs(int v){
	used[v] = 1;
	sum+= cost[v];
	for(auto [to, c] : g[v]){
		if(used[to] == 0){
			cost[to] = c - cost[v];
			dfs(to);
		}else{
			
		}
	}
}

main(){
   ios::sync_with_stdio(0);
   cin.tie(0); cout.tie(0);
   long double  ans = 1e18;
	cin >> n >> m;
	for(int i = 0;i < m; i++){
		int a, b, c; cin >> a >> b >> c;
		g[a].push_back({b, (long double)c * 1.0});
		g[b].push_back({a, (long double)c * 1.0});
	}
	vector<long double> how(n + 1);
	for(int i = 1;i <= n; i++){
		for(int j = 1;j <= n; j++) used[j] = 0;
		sum = 0;
		cost[i] = 0;
		dfs(i);
		int ok = 1;
		for(int v = 1; v <= n && ok; v++){
			for(auto [to, c] : g[v]){
				if(cost[v] + cost[to] != c){
					ok = 0;
					break;
				}
			}
		}
		if(ans > sum && ok){
			ans = sum;
			for(int j = 1;j <= n; j++) how[j] = cost[j];
		}
	} 
	for(int i = 1;i <= n; i++){
		for(int j = 1;j <= n; j++) used[j] = 0;
		sum = 0;
		cost[i] = 0.5;
		dfs(i);
		int ok = 1;
		for(int v = 1; v <= n && ok; v++){
			for(auto [to, c] : g[v]){
				if(cost[v] + cost[to] != c){
					ok = 0;
					break;
				}
			}
		}
		if(ans > sum && ok){
			ans = sum;
			for(int j = 1;j <= n; j++) how[j] = cost[j];
		}
	} 
//	cout << ans << '\n';
	if(ans >= 1e18){
		cout << "NO";
		return 0;
	}
	cout << "YES" << '\n';
	for(int i = 1;i <= n; i++) cout << how[i] << ' ';
	return 0;
}

Compilation message (stderr)

Graph.cpp:28:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   28 | main(){
      | ^~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 12
• Subtask 3: 0 / 17
• Subtask 4: 0 / 24
• Subtask 5: 0 / 42