Submission #795421

#	Time	Username	Problem	Language	Result	Execution time	Memory
795421		fatemetmhr	Toy Train (IOI17_train)	C++17	12 / 100	19 ms	24916 KiB

train

//  ~ Be Name Khoda ~  //
 
#include "train.h"
#include <bits/stdc++.h>
//#pragma GCC optimize ("O3")
//#pragma GCC target("avx2")
//#pragma GCC optimize("unroll-loops,Ofast")
 
using namespace std;
 
typedef long long ll;
 
#define pb       push_back
#define mp       make_pair
#define all(x)   x.begin(), x.end()
#define fi       first
#define se       second
 
const int maxn  =  1e6   + 10;
const int maxn5 =  5e5   + 10;
const int maxnt =  1.2e6 + 10;
const int maxn3 =  1e3   + 10;
const int mod   =  1e9   + 7;
const ll  inf   =  1e18;
 
int cnt[maxn5], q[maxn5];
vector <int> adj[maxn5], jda[maxn5];
bool mark[maxn5], good[maxn5];
 
 
std::vector<int> who_wins(std::vector<int> a, std::vector<int> ch, std::vector<int> u, std::vector<int> v) {
	int n = a.size(), m = u.size();
	int x;
	for(int i = 0; i < n; i++) if(ch[i])
		x = i;
 	for(int i = 0; i < m; i++){
 		adj[u[i]].pb(v[i]);
 		jda[v[i]].pb(u[i]);
 		cnt[u[i]]++;
 	}
 	int l = 0, r = 0;
 	for(auto u : jda[x]){
 		if(a[u]){
 			q[r++] = u;
 			good[u] = true;
 		}
 		else if(cnt[u] > 1)
 			cnt[u]--;
 		else{
 			q[r++] = u;
 			good[u] = true;
 		}
 	}
 	while(l < r){
 		int v = q[l++];
	 	for(auto u : jda[v]) if(!good[u]){
	 		if(a[u]){
	 			q[r++] = u;
	 			good[u] = true;
	 		}
	 		else if(cnt[u] > 1)
	 			cnt[u]--;
	 		else{
	 			q[r++] = u;
	 			good[u] = true;
	 		}
	 	}
 	}
 	vector <int> ret;
 	for(int i = 0; i < n; i++)
 		ret.pb(good[x] && good[i]);
 	return ret;
}

Compilation message (stderr)

train.cpp: In function 'std::vector<int> who_wins(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
train.cpp:33:6: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   33 |  int x;
      |      ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 11
• Subtask 4: 0 / 11
• Subtask 5: 12 / 12
• Subtask 6: 0 / 51