Submission #1221160

#	Time	Username	Problem	Language	Result	Execution time	Memory
1221160		FaresSTH	Cave (IOI13_cave)	C++20	0 / 100	1 ms	320 KiB

cave

#include "bits/stdc++.h"
#include "cave.h"
using namespace std;

void exploreCave(int n){
    bool v[1001] = {0}; // safer size if n <= 1000
    int s[1001] = {0}, d[1001] = {0};
    
    int in = tryCombination(s); // get initial score once
    for (int i = 0; i < n; i++) {
        int l = 0, r = n - 1;
        while (l < r) {
            int m = (l + r) / 2;
            for (int j = l; j <= m; j++) if (!v[j]) s[j] = !s[j];
            int cur = tryCombination(s);
            for (int j = l; j <= m; j++) if (!v[j]) s[j] = !s[j];
            if (in != cur) r = m;
            else l = m + 1;
        }
        if (in == tryCombination(s)) s[l] = !s[l]; // re-check before flipping
        d[i] = l;
        v[l] = true;
        in = tryCombination(s); // update in after flipping
    }
    answer(s, d);
}

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