Submission #1054905

#	Time	Username	Problem	Language	Result	Execution time	Memory
1054905		Wansur	Toy Train (IOI17_train)	C++17	0 / 100	2072 ms	1628 KiB

train

#include <bits/stdc++.h>
#include "train.h"
#define ent '\n'
#define  f first
#define s second
//#define int long long

using namespace std;
typedef long long ll;
const int maxn = 5e3 + 12;
const int mod = 1e9 + 7;

vector<int> g[maxn], rg[maxn];
bool won[maxn], del[maxn];
int out[maxn];
int n, m;

vector<int> who_wins(vector<int> a, vector<int> r, vector<int> U, vector<int> V){
    n = a.size(), m = U.size();
    vector<int> ans(n);

    function<bool(int)> check = [&](int v){
        for(int i=0;i<n;i++){
            won[i] = out[i] = 0;
            g[i].clear();
            rg[i].clear();
        }

        for(int i=0;i<m;i++){
            if(del[U[i]] || del[V[i]]){
                continue;
            }
            out[U[i]]++;
            g[U[i]].push_back(V[i]);
            rg[V[i]].push_back(U[i]);
        }

        queue<int> q;
        won[v] = 1;
        while(q.size()){
            int v = q.front();
            q.pop();
            for(int to:g[v]){
                if(a[to] == 1 && !won[to]){
                    won[to] = 1;
                    q.push(to);
                }
                if(a[to] == 0){
                    out[to]--;
                    if(!out[to]){
                        won[to] = 1;
                        q.push(to);
                    }
                }
            }
        }

        bool ok = 0;

        for(int to:g[v]){
            ok |= won[to];
        }

        if(ok){
            for(int i=0;i<n;i++){
                if(won[i]){
                    ans[i] = 1;
                    del[i] = 1;
                }
            }
            return 1;
        }

        return 0;
    };

    while(1){
        bool ok = 0;
        for(int i=0;i<n;i++){
            if(!del[i] && check(i)){
                ok = 1;
            }
        }
        if(!ok) break;
    }

    return ans;
}

Compilation message (stderr)

train.cpp: In lambda function:
train.cpp:24:29: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   24 |             won[i] = out[i] = 0;
      |                      ~~~~~~~^~~

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