Submission #835032

#	Time	Username	Problem	Language	Result	Execution time	Memory
835032		josiftepe	Cave (IOI13_cave)	C++14	100 / 100	210 ms	556 KiB

cave

#include "cave.h"
#include <bits/stdc++.h>
const int maxn = 5050;
int S[maxn], D[maxn];
int switched[maxn];
void exploreCave(int N) {
    for(int i = 0; i < N; i++) {
        int comb = (tryCombination(S) != i);
        int L = 0, R = N - 1;
        
        while(L < R) {
            int mid = (L + R) / 2;
            for(int j = L; j <= mid; j++) {
                if(!switched[j]) {
                    S[j] = 1 - S[j];
                }
            }
            int comb2 = (tryCombination(S) != i);
            for(int j = L; j <= mid; j++) {
                if(!switched[j]) {
                    S[j] = 1 - S[j];
                }
            }
            if(comb == comb2) {
                L = mid + 1;
            }
            else {
                R = mid;
            }
            
        }
        D[L] = i;
        if(comb == 0) {
            S[L] = 1 - S[L];
        }
        switched[L] = 1;
    }
    answer(S, D);
}

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