Submission #593447

#	Time	Username	Problem	Language	Result	Execution time	Memory
593447		gortomi	Cave (IOI13_cave)	C++14	100 / 100	384 ms	460 KiB

cave

#include "cave.h"

void exploreCave(int n)
{
    int position[n];
    for(int i = 0; i < n; i++) position[i] = -1;
    int guess[n];
    int ans[n];
    int pos;
    for(int i = 0; i < n; i++)
    {
        for(int j = 0; j < n; j++) guess[j] = position[j] == -1 ? 1 : position[j];
        int x = tryCombination(guess);
        if(x == -1) x = n;
        pos = x > i;
        int l = 0, r = n - 1;
        while(l != r)
        {
            int mid = (l + r) / 2;
            for(int j = 0; j < l; j++) guess[j] = position[j] == -1 ? 1 - pos : position[j];
            for(int j = l; j <= mid; j++) guess[j] = position[j] == -1 ? pos : position[j];
            for(int j = mid + 1; j < n; j++) guess[j] = position[j] == -1 ? 1 - pos : position[j];
            int x = tryCombination(guess);
            if(x == -1) x = n;
            if(x > i) r = mid;
            else l = mid + 1;
        }
        ans[l] = i;
        position[l] = pos;
    }
    answer(position, ans);
}

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