제출 #1000663

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1000663		fanwen	9월 (APIO24_september)	C++17	0 / 100	1 ms	348 KiB

september

#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>

using namespace std;
// using namespace __gnu_pbds;

#define fi first
#define se second
#define REP(i, n) for (auto i = 0; i < (n); ++i)
#define FOR(i, a, b) for (auto i = (a); i <= (b); ++i)
#define FORD(i, a, b) for (auto i = (a); i >= (b); --i)
#define FORE(i, a, b) for (auto i = (a); i < (b); ++i)
#define MASK(x) (1LL << (x))
#define BIT(x, i) (((x) >> (i)) & 1)
#define ALL(x) (x).begin(), (x).end()
#define left ___left 
#define right ___right 
#define __builtin_popcount __builtin_popcountll

int solve(int N, int M, std::vector<int> F, std::vector<std::vector<int>> S) {
    int ans = 0, res = 0; 
    vector <vector <int>> adj(N);
    for (int i = 1; i < N; ++i) {
        adj[F[i]].emplace_back(i); 
    }
    vector <int> d(N); 
    int num_node = 0;
    function <void(int)> dfs = [&] (int u) -> void {
        if(d[u]) return; 
        d[u] = true; 
        num_node++;
        for (auto v : adj[u]) dfs(v);
    };
    for (int i = 0; i < N - 1; ++i) {
        for (int j = 0; j < M; ++j) {
            dfs(S[j][i]);
        }
        if(num_node == 1) {
            ans++;
            num_node = 0;
        }
    }
    return ans; 
}

#ifdef LOCAL 

#include <cassert>
#include <cstdio>
#include <vector>

void taskcase() {
    int N, M;
    assert(2 == scanf("%d%d", &N, &M));
    
    std::vector<int> F(N);
    F[0] = -1;
    for (int i = 1; i < N; ++i)
        assert(1 == scanf("%d", &F[i]));
    
    std::vector<std::vector<int>> S(M, std::vector<int>(N - 1));
    for (int i = 0; i < M; ++i)
        for (int j = 0; j < N - 1; ++j)
            assert(1 == scanf("%d", &S[i][j]));
    
    printf("%d\n", solve(N, M, F, S));
}

int main() {
    freopen("TASK.inp", "r", stdin); 
    freopen("TASK.out", "w", stdout);
    int T;
    assert(1 == scanf("%d", &T));
    while(T--) taskcase();
    return 0;
}

#endif 

// Dream it. Wish it. Do it.

컴파일 시 표준 에러 (stderr) 메시지

september.cpp: In function 'int solve(int, int, std::vector<int>, std::vector<std::vector<int> >)':
september.cpp:22:18: warning: unused variable 'res' [-Wunused-variable]
   22 |     int ans = 0, res = 0;
      |                  ^~~

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