Submission #798598

#	Time	Username	Problem	Language	Result	Execution time	Memory
798598		Liudas	Cave (IOI13_cave)	C++17	100 / 100	256 ms	460 KiB

cave

#include <bits/stdc++.h>
#include "cave.h"
using namespace std;
void exploreCave(int N){
    bool lock[N] = {0};
    int ans[N] = {0};
    int check[N] = {0};
    for(int i = 0; i < N; i ++){
        for(int j = 0; j < N; j ++){
            if(!lock[j]){
                check[j] = 0;
            }
        }
        int sign = 0, op;
        int t = tryCombination(check);
        if(t > i || t < 0){
            sign = 0;
        }
        else{
            sign = 1;
        }
        op = abs(sign - 1);
        int l = 0, r = N;
        //cout << "beg " << i << endl;
        while(l + 1 < r){
            int mid = (l + r+1) / 2;
            for(int j = l; j < mid; j ++){
                if(!lock[j])check[j]=sign;
            }
            for(int j = mid; j < r; j ++){
                if(!lock[j])check[j]=op;
            }
            int a = tryCombination(check);
            if(a <= i && a >= 0){
                l = mid;
            }
            else{
                r = mid;
            }
        }
        lock[l] = true;
        ans[l] = i;
        check[l] = sign;
    }
    answer(check, ans);
}

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