Submission #448228

#	Time	Username	Problem	Language	Result	Execution time	Memory
448228		hizuna	스파이 (JOI13_spy)	C++17	100 / 100	228 ms	16452 KiB

spy

#include <bits/stdc++.h>

using namespace std;
using lint = long long;

vector<int> child[2][2003];
int f[2003][2003], N, M, a, r, s, root[2];

void dfsi(int u) {
    for(auto v : child[0][u]) {
        for(int i = 0; i < N; i++) {
            f[v][i] += f[u][i];
        }
        dfsi(v);
    }
}

void dfsj(int u) {
    for(auto v : child[1][u]) {
        for(int i = 0; i < N; i++) {
            f[i][v] += f[i][u];
        }
        dfsj(v);
    }
}

int main() {
    scanf("%d%d", &N, &M);
    for(int i = 0; i < N; i++) {
        for(int j = 0; j <= 1; j++) {
            scanf("%d", &a);
            if(a == 0) root[j] = i; else child[j][--a].push_back(i);
        }
    }

    for(int i = 0; i < M; i++) {
        scanf("%d%d", &r, &s);
        f[--r][--s]++;
    }

    dfsi(root[0]);
    dfsj(root[1]);

    for(int i = 0; i < N; i++) {
        printf("%d\n", f[i][i]);
    }
    return 0;
}

Compilation message (stderr)

spy.cpp: In function 'int main()':
spy.cpp:28:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     scanf("%d%d", &N, &M);
      |     ~~~~~^~~~~~~~~~~~~~~~
spy.cpp:31:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |             scanf("%d", &a);
      |             ~~~~~^~~~~~~~~~
spy.cpp:37:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         scanf("%d%d", &r, &s);
      |         ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 70 / 70