Submission #1105672

#	Time	Username	Problem	Language	Result	Execution time	Memory
1105672		jadai007	Cave (IOI13_cave)	C++17	100 / 100	217 ms	760 KiB

cave

#include "cave.h"
#include<bits/stdc++.h>
 
using namespace std;
 
void exploreCave(int N) {
    int swi[5005] = {0}, door[5005] = {0}, tmp[5005] = {0}, state[5005] = {0};
    for(int i = 0; i < N; ++i){
        int l = 0, r = N - 1;
        int ck = tryCombination(swi);
        int open = ((ck == -1 || ck > i) ? 1 : 0);
        while(l < r){
            int mid = (l + r) >> 1;
            for(int j = 0; j < N; ++j) tmp[j] = swi[j];
            for(int j = l; j <= mid; ++j) if(!state[j]) tmp[j]^=1;
            if(open){
                if(tryCombination(tmp) == i) r = mid;
                else l = mid + 1;
            }
            else{
                int ck = tryCombination(tmp);
                if(ck > i || ck == -1) r = mid;
                else l = mid + 1;
            }
        }
        door[r] = i;
        state[r] = 1;
        if(!open) swi[r]^=1;
    }
    answer(swi, door);
}

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