Submission #163133

#	Time	Username	Problem	Language	Result	Execution time	Memory
163133		mhy908	Cave (IOI13_cave)	C++14	100 / 100	443 ms	604 KiB

cave

#include "cave.h"
#include <bits/stdc++.h>
using namespace std;
int now[5010], where[5010], n;
bool ch[5010];
void rev(int a, int b){
    for(int i=a; i<=b; i++)if(!ch[i])now[i]^=1;
}
int tryc(int S[]){
    int tmp=tryCombination(now);
    if(tmp==-1)return n;
    return tmp;
}
int binsearch(int st, int fin, bool fl, int num){
    if(st==fin)return st;
    int mid=(st+fin)/2;
    if(fl){
        rev(st, mid);
        if(tryc(now)!=num){
            rev(st, mid);
            return binsearch(st, mid, fl, num);
        }
        rev(st, mid);
        return binsearch(mid+1, fin, fl, num);
    }
    else{
        rev(st, mid);
        if(tryc(now)==num){
            rev(st, mid);
            return binsearch(st, mid, fl, num);
        }
        rev(st, mid);
        return binsearch(mid+1, fin, fl, num);
    }
}
void exploreCave(int _n){
    n=_n;
    for(int i=0; i<n; i++){
        int temp=tryc(now);
        int but=binsearch(0, n-1, temp==i, i);
        if(temp==i){
            where[but]=i;
            rev(but, but);
            ch[but]=true;
        }
        else{
            where[but]=i;
            ch[but]=true;
        }
    }
    answer(now, where);
}

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