제출 #1048676

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1048676		Plurm	9월 (APIO24_september)	C++17	59 / 100	142 ms	23968 KiB

september

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

vector<vector<int>> g;
vector<vector<int>> mxn;
vector<vector<int>> bck;
void dfs(int u, int p = -1){
    for(int v : g[u]) dfs(v);
    for(int i = 0; i < bck.size(); i++){
        mxn[i][u] = bck[i][u];
        for(int v : g[u]){
            mxn[i][u] = max(mxn[i][u], mxn[i][v]);
        }
    }
}
vector<int> rndperm;
const int MOD = 1e9+7;
class HashedSet{
public:
    int a, b;
    HashedSet() : a(0), b(1) {}
    void insert(int x){
        a += rndperm[x];
        a %= MOD;
        b = 1ll * b * rndperm[x] % MOD;
    }
    friend bool operator!=(const HashedSet& h1, const HashedSet& h2){
        return h1.a != h2.a || h1.b != h2.b;
    }
};
int solve(int N, int M, vector<int> F, vector<vector<int>> S) {
    if(rndperm.empty()){
        rndperm.resize(100005);
        default_random_engine dre;
        uniform_int_distribution<int> uid(1, 1000000000);
        for(int i = 0; i <= 100000; i++) rndperm[i] = uid(dre);
    }
    g.resize(N);
    for(int i = 1; i < N; i++){
        g[F[i]].push_back(i);
    }
    bck.resize(M);
    mxn.resize(M);
    for(int i = 0; i < M; i++){
        bck[i].resize(N);
        mxn[i].resize(N);
        for(int j = 0; j < N-1; j++){
            bck[i][S[i][j]] = j;
        }
    }
    dfs(0);
    int k = 0;
    int l = 0;
    while(l < N-1){
        // left: l
        vector<HashedSet> ss(M);
        int mnr = l-1;
        int i = l;
        bool ok = true;
        do{
            mnr++;
            while(i <= mnr){
                for(int j = 0; j < M; j++){
                    ss[j].insert(S[j][i]);
                    mnr = max(mnr, mxn[j][S[j][i]]);
                }
                i++;
            }
            for(int j = 1; j < M; j++) if(ss[j] != ss[0]) ok = false;
        }while(!ok);
        l = mnr+1;
        k++;
    }
    g.clear();
    bck.clear();
    mxn.clear();
	return k;
}

컴파일 시 표준 에러 (stderr) 메시지

september.cpp: In function 'void dfs(int, int)':
september.cpp:10:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     for(int i = 0; i < bck.size(); i++){
      |                    ~~^~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 0 / 14
• Subtask 3: 5 / 5
• Subtask 4: 9 / 9
• Subtask 5: 5 / 5
• Subtask 6: 0 / 11
• Subtask 7: 9 / 9
• Subtask 8: 11 / 11
• Subtask 9: 9 / 9
• Subtask 10: 0 / 16