Submission #2121978


Source Code Expand

#include <bits/stdc++.h>
#define REP(i,n) for (int i=0;i<(n);i++)
#define FOR(i,s,e) for (int i=s;i<(e);i++)
#define All(v) (v).begin(),(v).end()
#define mp(a,b) make_pair(a,b)
#define pb(a) push_back(a)
using namespace std;
typedef long long llint;
typedef pair<int, int> P;
const int MOD = (int)1e9 + 7;
const int INF = 999999999;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    int N, M;
    cin >> N >> M;
    vector<int> box(N, 1), prob(N, 0);
    prob[0] = 1;
    REP(i, M){
        int x, y;
        cin >> x >> y;
        x--; y--;
        box[x]--;
        box[y]++;
        prob[y] = prob[x];
    }
    int ans = 0;
    REP(i, N){
        //cout << box[i] << " " << prob[i] << "\n";
        if(box[i] != 0 && prob[i] == 1) ans++;
    }

    cout << ans << "\n";
    
    return 0;
}

Submission Info

Submission Time
Task B - Box and Ball
User AokabiC
Language C++14 (GCC 5.4.1)
Score 0
Code Size 848 Byte
Status WA
Exec Time 18 ms
Memory 1024 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 0 / 400
Status
AC × 3
AC × 7
WA × 20
Set Name Test Cases
Sample 0_00.txt, 0_01.txt, 0_02.txt
All 0_00.txt, 0_01.txt, 0_02.txt, 1_00.txt, 1_01.txt, 1_02.txt, 1_03.txt, 1_04.txt, 1_05.txt, 1_06.txt, 1_07.txt, 1_08.txt, 1_09.txt, 1_10.txt, 1_11.txt, 1_12.txt, 1_13.txt, 1_14.txt, 1_15.txt, 1_16.txt, 1_17.txt, 1_18.txt, 1_19.txt, 1_20.txt, 1_21.txt, 1_22.txt, 1_23.txt
Case Name Status Exec Time Memory
0_00.txt AC 1 ms 256 KB
0_01.txt AC 1 ms 256 KB
0_02.txt AC 1 ms 256 KB
1_00.txt AC 1 ms 256 KB
1_01.txt WA 1 ms 256 KB
1_02.txt AC 1 ms 256 KB
1_03.txt WA 1 ms 256 KB
1_04.txt WA 15 ms 1024 KB
1_05.txt AC 17 ms 1024 KB
1_06.txt WA 14 ms 640 KB
1_07.txt AC 16 ms 640 KB
1_08.txt WA 12 ms 512 KB
1_09.txt WA 13 ms 896 KB
1_10.txt WA 5 ms 768 KB
1_11.txt WA 7 ms 384 KB
1_12.txt WA 2 ms 1024 KB
1_13.txt WA 16 ms 768 KB
1_14.txt WA 8 ms 384 KB
1_15.txt WA 13 ms 384 KB
1_16.txt WA 2 ms 768 KB
1_17.txt WA 18 ms 1024 KB
1_18.txt WA 16 ms 640 KB
1_19.txt WA 17 ms 512 KB
1_20.txt WA 16 ms 384 KB
1_21.txt WA 14 ms 640 KB
1_22.txt WA 18 ms 768 KB
1_23.txt WA 6 ms 768 KB