제출 #1311149

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1311149		vanguard	9월 (APIO24_september)	C++20	0 / 100	1 ms	568 KiB

september

#include "september.h"
#include <vector>

int solve(int N, int M, std::vector<int> F, std::vector<std::vector<int>> S) {
    std::vector<int> seen_count(N, 0);
    std::vector<int> child_count(N, 0);
    
    
    for (int i = 1; i < N; i++) {
        child_count[F[i]]++;
    }

    int unresolved = 0;
    int day_count = 0;

    for (int i = 0; i < N - 1; i++) {
        for (int j = 0; j < M; j++) {
            int node = S[j][i];
            seen_count[node]++;
            
            if (seen_count[node] == 1) unresolved++;
            
            if (seen_count[node] == M) {
                unresolved--;
                
                int curr = node;
                while (curr != 0) {
                    int parent = F[curr];
                    child_count[parent]--;
                    if (child_count[parent] == 0 && (parent == 0 || seen_count[parent] == M)) {
                        curr = parent; 
                    } else {
                        break;
                    }
                }
            }
        }
        
        if (unresolved == 0) {
            day_count++;
        }
    }
    return day_count;
}

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