Submission #256534

#	Time	Username	Problem	Language	Result	Execution time	Memory
256534		Harry464	Cave (IOI13_cave)	C++14	0 / 100	1120 ms	532 KiB

cave

#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <cstring>
#include "cave.h"

using namespace std;

void exploreCave(int n)
{
    vector <int> sw(n,0);
    vector <int> odg(n,-1);
    for (int j = 0; j < n; j++){
        vector <int> t = sw;
        vector <int> free;
        for (int i = 0; i < n; i++)
            if (odg[i] == -1)
             free.push_back(i), t[i] = 1;
        int ask = tryCombination(&t[0]);
        int trig;
        if (ask == j)
            trig = 0;
        else
            trig = 1;
        int l = 0, r = free.size() - 1;
        while (l < r){
            int mid = (l+r)/2;
            for (int i = l; i <= mid; i++)
                t[free[i]] = trig;
            for (int i = 0; i < l; i++)
                t[free[i]] = (trig+1)%2;
            for (int i = mid + 1; i < free.size(); i++)
                t[free[i]] = (trig+1)%2;
            ask = tryCombination(&t[0]);
            if (ask == j)
                 l = mid + 1;
            else
                 r = mid;
        }
        sw[l] = trig;
        odg[l] = j;
    }
    answer(&sw[0],&odg[0]);
}

Compilation message (stderr)

cave.cpp: In function 'void exploreCave(int)':
cave.cpp:33:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int i = mid + 1; i < free.size(); i++)
                                   ~~^~~~~~~~~~~~~

• Subtask 1: 0 / 12
• Subtask 2: 0 / 13
• Subtask 3: 0 / 21
• Subtask 4: 0 / 30
• Subtask 5: 0 / 24