제출 #112238

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
112238		kdh9949	Meetings (JOI19_meetings)	C++17	100 / 100	689 ms	1016 KiB

meetings

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

using pii = pair<int, int>;
#define X first
#define Y second

static vector<pii> ans;
static vector<int> u[2005];
static int piv;

int ask(int x, int y, int z){
    return Query(x - 1, y - 1, z - 1) + 1;
}

void f(vector<int> v){
    if(v.size() <= 2){
        if(v.size() == 2) ans.emplace_back(v[0], v[1]);
        return;
    }
    for(int i : v){
        u[i].clear();
    }
    random_shuffle(v.begin(), v.end());
    u[v[0]].push_back(v[0]);
    u[v[1]].push_back(v[1]);
    for(int i = 2; i < v.size(); i++){
        int t = ask(v[0], v[1], v[i]);
        u[t].push_back(v[i]);
    }
    vector<int> w;
    for(int i : v){
        if(u[i].empty()) continue;
        w.push_back(i);
    }
    for(int i = 0; i < w.size(); i++) if(w[i] == v[0]) swap(w[0], w[i]);
    for(int i = 0; i < w.size(); i++) if(w[i] == v[1]) swap(w[w.size() - 1], w[i]);
    piv = w[0];
    if(w.size() >= 4) sort(w.begin() + 1, w.end() - 1, [](int x, int y){
        return ask(piv, x, y) == x;
    });
    for(int i = 1; i < w.size(); i++) ans.emplace_back(w[i - 1], w[i]);
    for(int i : w) f(u[i]);
}

void Solve(int n){
    vector<int> v;
    for(int i = 1; i <= n; i++) v.push_back(i);
    f(v);
    for(pii i : ans) Bridge(min(i.X, i.Y) - 1, max(i.X, i.Y) - 1);
}

컴파일 시 표준 에러 (stderr) 메시지

meetings.cpp: In function 'void f(std::vector<int>)':
meetings.cpp:28:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 2; i < v.size(); i++){
                    ~~^~~~~~~~~~
meetings.cpp:37:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < w.size(); i++) if(w[i] == v[0]) swap(w[0], w[i]);
                    ~~^~~~~~~~~~
meetings.cpp:38:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < w.size(); i++) if(w[i] == v[1]) swap(w[w.size() - 1], w[i]);
                    ~~^~~~~~~~~~
meetings.cpp:43:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 1; i < w.size(); i++) ans.emplace_back(w[i - 1], w[i]);
                    ~~^~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 10 / 10
• Subtask 3: 12 / 12
• Subtask 4: 71 / 71