Submission #120398

#	Time	Username	Problem	Language	Result	Execution time	Memory
120398		pavel	Meetings (JOI19_meetings)	C++14	100 / 100	1181 ms	1032 KiB

meetings

#include <vector>
#include <map>
#include <algorithm>
#include <cstdlib>
#include "meetings.h"


using namespace std;

struct cmp{
    int a;
    cmp(int b){
        a=b;
    }
    bool operator()(int x, int y){
        if(x==a) return y!=a;
        if(y==a) return false;
        return Query(a, x, y)==x;
    }
};


void SolveSubTree(vector<int> nodes){
    if(nodes.size()<=1) return;
    int a=rand()%nodes.size(), b=rand()%nodes.size();
    while(a==b){
        b=rand()%nodes.size();
    }
    a=nodes[a];b=nodes[b];
    map<int, vector<int>> sts;
    sts[a].push_back(a);
    sts[b].push_back(b);
    for(int j=0;j<nodes.size();++j){
        if(nodes[j]!=a && nodes[j]!=b){
            int x = Query(a, b, nodes[j]);
            sts[x].push_back(nodes[j]);
        }
    }

    vector<int> path;
    for(auto i:sts){
        path.push_back(i.first);
    }
    sort(path.begin(), path.end(), cmp(a));

    for(int i=1;i<path.size();++i){
        int x=min(path[i-1], path[i]);
        int y=max(path[i-1], path[i]);
        Bridge(x, y);
    }
    
    for(auto i:sts){
        SolveSubTree(i.second);
    }
}



void Solve(int N) {
    vector<int> s;
    for(int i=0;i<N;++i) s.push_back(i);
    SolveSubTree(s);
}

Compilation message (stderr)

meetings.cpp: In function 'void SolveSubTree(std::vector<int>)':
meetings.cpp:33:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int j=0;j<nodes.size();++j){
                 ~^~~~~~~~~~~~~
meetings.cpp:46:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=1;i<path.size();++i){
                 ~^~~~~~~~~~~~

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