제출 #720648

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
720648		Toxtaq	슈퍼트리 잇기 (IOI20_supertrees)	C++17	0 / 100	1 ms	296 KiB

supertrees

#ifndef SUPERTREES_H_INCLUDED
#define SUPERTREES_H_INCLUDED
#include "supertrees.h"
#include<bits/stdc++.h>
using namespace std;
struct DSU{
    vector<int>par;
    DSU(int n){
        par.assign(n, -1);
    }
    int FindRep(int u){
        if(par[u] < 0)return u;
        return par[u] = FindRep(par[u]);
    }
    void Union(int u, int v){
        u = FindRep(u);
        v = FindRep(v);
        if(u == v)return;
        if(par[u] > par[v])swap(u, v);
        par[u] += par[v];
        par[v] = u;
    }
    bool IsConnected(int u, int v){
        u = FindRep(u);
        v = FindRep(v);
        return (u == v);
    }
};
int N;
void build(vector<vector<int>>b);
vector<bool>vis;
vector<vector<int>>B;
vector<int>components;
void dfs(int u){
    components.push_back(u);
    vis[u] = 1;
    for(int i = 0;i < N;++i){
        if(B[u][i] && !vis[i]){
            dfs(i);
        }
    }
}
bool Check(vector<vector<int>>p){
    for(int i = 0;i < N;++i){
        for(int j = 0;j < N;++j){
            if(p[i][j] == 2)return 1;
        }
    }
    return 0;
}
int construct(vector<vector<int>>p){
    bool ch = Check(p);
    if(ch){
        N = p.size();
        DSU dsu1(N);
        vis.resize(N);
        B.assign(N, vector<int>(N));
        vector<vector<int>>ans(N, vector<int>(N));
        for(int i = 0;i < N;++i){
            for(int j = 0;j < N;++j){
                if(p[i][j] && i != j){
                    if(dsu1.IsConnected(i, j))continue;
                    dsu1.Union(i, j);
                    B[i][j] = B[j][i] = 1;
                }
            }
        }
        for(int i = 0;i < N;++i){
            for(int j = 0;j < N;++j){
                if(i != j && !p[i][j] && dsu1.IsConnected(i, j))return 0;
            }
        }
        for(int i = 0;i < N;++i){
            int p = dsu1.FindRep(i);
            if(dsu1.par[p] == -2)return 0;
        }
        for(int i = 0;i < N;++i){
            if(!vis[i]){
                dfs(i);
                if(components.size() > 2){
                    for(int j = 1;j < components.size();++j){
                        ans[components[j]][components[j - 1]] = ans[components[j - 1]][components[j]] = 1;
                    }
                    ans[components.back()][components[0]] = ans[components[0]][components.back()] = 1;
                }
                components.clear();
            }
        }
        build(ans);
    }
    else{
        int n = N;
        DSU dsu1(n);
        vector<vector<int>>b(n, vector<int>(n));
        for(int i = 0;i < n;++i){
            for(int j = 0;j < n;++j){
                if(p[i][j] && i != j){
                    if(dsu1.IsConnected(i, j))continue;
                    dsu1.Union(i, j);
                    b[i][j] = b[j][i] = 1;
                }
            }
        }
        for(int i = 0;i < n;++i){
            for(int j = 0;j < n;++j){
                if(i != j && !p[i][j] && dsu1.IsConnected(i, j))return 0;
            }
        }
        build(b);
    }
    return 1;
}


#endif // SUPERTREES_H_INCLUDED

컴파일 시 표준 에러 (stderr) 메시지

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:81:37: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   81 |                     for(int j = 1;j < components.size();++j){
      |                                   ~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 10
• Subtask 3: 0 / 19
• Subtask 4: 0 / 35
• Subtask 5: 0 / 21
• Subtask 6: 0 / 4