Submission #993136

#	Time	Username	Problem	Language	Result	Execution time	Memory
993136		vjudge1	Cave (IOI13_cave)	C++17	100 / 100	165 ms	600 KiB

cave

#include "cave.h"
using namespace std;

int n2;
int ask(int x[]){
    int ts=tryCombination(x);
    if(ts==-1)return n2;
    return ts;
}
void exploreCave(int N) {
    n2=N;
    int d[N]={},s[N]={};
    bool dn[N]={};
    if(N==1){
        if(ask(s)!=1)s[0]=1;
        answer(s,d);
        return;
    }
    int ts=ask(s),ts2;
    for(int i=0; i<N; i++){
        int l=0,r=N-1;
        while(l<=r){
            if(l==r){
                dn[l]=1;
                d[l]=i;
                if(ts2<=i)s[l]^=1;
                ts=ask(s);
                break;
            }
            int md=(l+r)/2;
            for(int j=l; j<=md; j++){
                if(dn[j])continue;
                s[j]^=1;
            }
            ts2=ask(s);
            if((ts<=i && ts2>=i+1) || (ts>=i+1 && ts2<=i)){
                r=md;
                ts=ts2;
            }
            else{
                l=md+1;
            }
        }
    }
    answer(s,d);
}

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