Submission #2123643


Source Code Expand

#include<bits/stdc++.h>
#define mp make_pair
#define F first
#define S second
using namespace std;

typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef long long ll;
typedef vector<int> vi;

const int MAXN = 1e5 +2;
int balls[MAXN], n, m, x, y, ans;
bool red[MAXN];

int main(){
//	freopen(".in", "r", stdin);
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

	cin >> n >> m;
	fill(balls, balls + n + 1, 1);
	red[1] = true;
	ans = 1;

	while(m--){
		cin >> x >> y;
		if(red[x]){
			if(balls[x] == 1){
				ans--;
				red[x] = false;
			}
			if(!red[y]) ans++;
			red[y] = true;
		}
		balls[x]--;
		balls[y]++;
	}

	cout << ans;

	return 0;
}

Submission Info

Submission Time
Task B - Box and Ball
User vjudge1
Language C++14 (GCC 5.4.1)
Score 400
Code Size 654 Byte
Status AC
Exec Time 18 ms
Memory 768 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 400 / 400
Status
AC × 3
AC × 27
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 AC 1 ms 256 KB
1_02.txt AC 1 ms 256 KB
1_03.txt AC 1 ms 256 KB
1_04.txt AC 14 ms 640 KB
1_05.txt AC 16 ms 768 KB
1_06.txt AC 14 ms 512 KB
1_07.txt AC 16 ms 512 KB
1_08.txt AC 11 ms 512 KB
1_09.txt AC 12 ms 640 KB
1_10.txt AC 4 ms 640 KB
1_11.txt AC 7 ms 384 KB
1_12.txt AC 2 ms 768 KB
1_13.txt AC 15 ms 512 KB
1_14.txt AC 9 ms 384 KB
1_15.txt AC 14 ms 384 KB
1_16.txt AC 2 ms 512 KB
1_17.txt AC 17 ms 768 KB
1_18.txt AC 16 ms 512 KB
1_19.txt AC 18 ms 384 KB
1_20.txt AC 17 ms 384 KB
1_21.txt AC 14 ms 512 KB
1_22.txt AC 17 ms 640 KB
1_23.txt AC 5 ms 640 KB