Submission #755484

#	Time	Username	Problem	Language	Result	Execution time	Memory
755484		Godgift42	Cave (IOI13_cave)	C++14	100 / 100	222 ms	472 KiB

cave

#include "cave.h"
using namespace std;

void exploreCave(int N) {
    int s[N];
    int d[N];
    int c[N];
    for(int i=0;i<N;i++){
        s[i]=0;
        c[i]=0;
    }
    
    for(int i=0;i<N;i++){
        int e = tryCombination(s);
        if(e==i){
            for(int j=0;j<N;j++){
                if(!c[j]){
                    if(s[j]==0) s[j]++;
                    else s[j]--;
                }
            }
        }
        int l=0;int r=N-1;
        int pre=1;
        int t;
        while(l<r){
            t=(l+r)/2;
            for(int j=l;j<=t;j++){
                if(!c[j]){
                    if(s[j]==0) s[j]++;
                    else s[j]--;
                }
            }
            e = tryCombination(s);
            if(e==i) e=0;
            else e=1;
            if((e==0 and pre==1) or (e==1 and pre==0)){
                r=t;
                pre=e;
            }
            else{
                l = t+1;
                pre=e;
            }
        }
        d[l]=i;
        c[l]=1;
        if(pre==0){
            if(s[l]==0) s[l]++;
            else s[l]--;
        }
    }

    answer(s,d);
}

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