Submission #2792529

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

#define NDEBUG
#ifdef DEBUG
#include "../cout11.h"
#undef NDEBUG
#endif
#include <cassert>

typedef long long ll;
typedef long double Double;
typedef unsigned long long ull;
typedef pair<int,int> ii;
typedef pair<ll,ll> llll;
typedef pair<double,double> dd;

typedef vector<int> vi;
typedef vector<vector<int>> vvi;
typedef vector<ii> vii;
typedef vector<vector<ii>> vvii;
typedef vector<ll> vll;
typedef vector<string> vs;
typedef vector<double> vd;
typedef vector<long double> vD;

#define sz(a)  int((a).size())
#define pb  push_back
#define FOR(var,from,to) for(int var=(from);var<=(to);++var)
#define rep(var,n)  for(int var=0;var<(n);++var)
#define rep1(var,n)  for(int var=1;var<=(n);++var)
#define repC2(vari,varj,n)  for(int vari=0;vari<(n)-1;++vari)for(int varj=vari+1;varj<(n);++varj)
#define ALL(c)  (c).begin(),(c).end()
#define RALL(c)  (c).rbegin(),(c).rend()
#define tr(i,c)  for(auto i=(c).begin(); i!=(c).end(); ++i)
#define found(s,e)  ((s).find(e)!=(s).end())
#define mset(arr,val)  memset(arr,val,sizeof(arr))
#define mid(x,y) ((x)+((y)-(x))/2)
#define IN(x,a,b) ((a)<=(x)&&(x)<=(b))
#define cons make_pair



ll solve(int N,int M,vi& x,vi& y) {
    vi p(N, 0), k(N, 1);
    p[0] = 1;
    rep(i,M){
        int fr = x[i]-1, to = y[i]-1;
        if (p[fr]) p[to] = 1;
        --k[fr]; ++k[to];
        if (k[fr] == 0) p[fr] = 0;
    }
#ifdef DEBUG
    cerr << k << endl;
    cerr << p << endl;
#endif
    int cnt = 0;
    rep(i,N){
        if (k[i] != 0) cnt += p[i];
    }
    return cnt;
}

int main() {
    int N,M; cin>>N>>M; // 2-1e5 1-1e5
    vi x(M),y(M);
    rep(i,M) cin>>x[i]>>y[i];
    cout << solve(N,M,x,y) << endl;
    return 0;
}

Submission Info

Submission Time
Task B - Box and Ball
User naoya_t
Language C++14 (GCC 5.4.1)
Score 400
Code Size 1782 Byte
Status
Exec Time 57 ms
Memory 1792 KB

Test Cases

Set Name Score / Max Score Test Cases
Sample 0 / 0 0_00.txt, 0_01.txt, 0_02.txt
All 400 / 400 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 1 ms 256 KB
0_01.txt 1 ms 256 KB
0_02.txt 1 ms 256 KB
1_00.txt 1 ms 256 KB
1_01.txt 1 ms 256 KB
1_02.txt 1 ms 256 KB
1_03.txt 1 ms 256 KB
1_04.txt 46 ms 1792 KB
1_05.txt 57 ms 1792 KB
1_06.txt 45 ms 1408 KB
1_07.txt 56 ms 1408 KB
1_08.txt 35 ms 1024 KB
1_09.txt 37 ms 1408 KB
1_10.txt 12 ms 896 KB
1_11.txt 21 ms 640 KB
1_12.txt 3 ms 1024 KB
1_13.txt 47 ms 1408 KB
1_14.txt 25 ms 768 KB
1_15.txt 42 ms 1024 KB
1_16.txt 2 ms 768 KB
1_17.txt 56 ms 1792 KB
1_18.txt 50 ms 1280 KB
1_19.txt 54 ms 1200 KB
1_20.txt 50 ms 1152 KB
1_21.txt 43 ms 1152 KB
1_22.txt 56 ms 1536 KB
1_23.txt 15 ms 1024 KB