Submission #160044

#	Time	Username	Problem	Language	Result	Execution time	Memory
160044		combi1k1	Library (JOI18_library)	C++14	0 / 100	626 ms	636 KiB

library

#include<bits/stdc++.h>
#include "library.h"

using namespace std;

vector<int> ASK;

int ask(vector<int> v)  {
    if (v.size() == 1)  return  1;
    for(int &x : ASK)   x = 0;
    for(int &x : v)     ASK[x - 1] = 1;

    return  Query(ASK);
}

int Connected(int u,vector<int> v)  {
    int a = ask(v); v.push_back(u);
    int b = ask(v); return  a >= b;
}
vector<int> g[1001];

void Solve(int n)   {
    ASK.resize(n);
    for(int i = 1 ; i <= n ; ++i)   {
        vector<int> v;

        int x = i;
        int y = 0;

        if (g[i].size())    y = g[i][0];

        for(int j = 1 ; j <= n ; ++j)   if (j != x && j != y)
            v.push_back(j);

        int l = 0;
        int r = v.size();

        for(; l < r ;)  {
            int m = (l + r) / 2;
            if (Connected(i,vector<int>(v.begin() + l,v.begin() + m + 1)))
                r = m;
            else
                l = m + 1;
        }
        if (l < v.size())   {
            x = v[l];
            g[i].push_back(x);
            g[x].push_back(i);
        }
    }
    vector<int> res;

    for(int i = 1 ; i <= n ; ++i)   if (g[i].size() == 1)   {
        int x = i;
        res.push_back(0);

        for(int j = 0 ; j < n ; ++j)
        for(int u : g[x])   if (u != res.back())    {
            res.push_back(x);
            x = u;  break;
        }
        res.push_back(x);
        res.erase(res.begin());

        Answer(res);    return;
    }
}

Compilation message (stderr)

library.cpp: In function 'void Solve(int)':
library.cpp:45:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if (l < v.size())   {
             ~~^~~~~~~~~~

• Subtask 1: 0 / 19
• Subtask 2: 0 / 81