Submission #58068

#	Time	Username	Problem	Language	Result	Execution time	Memory
58068		naderjemel	Cave (IOI13_cave)	C++14	100 / 100	467 ms	640 KiB

cave

#include "cave.h"

#include <bits/stdc++.h>
using namespace std;
int s[5000],ss[5000],d[5000];

void exploreCave(int N) {
    for(int i=0;i<N;i++){
    	s[i]=0;
    	d[i]=-1;
    }
    bool done[5005];
    memset(done,false,sizeof(done));
    for(int i=0;i<N;i++){
    	int lo=0,hi=N-1;
    	int rs;
    	int r=tryCombination(s);
    	if(r==i){ // it opens with 1
    		while(lo<=hi){
    			int mid=(lo+hi)>>1;
    			for(int j=mid;j<N;j++) ss[j]=s[j];
    			for(int j=lo;j<=mid;j++){
    				if(done[j]) ss[j]=s[j];
    				else ss[j]=1;
    			}
    			int rr=tryCombination(ss);
    			if(rr==i){
    				lo=mid+1;
    			}
    			else{
    				hi=mid-1;
    				rs=mid;
    			}
    		}
    		d[rs]=i;
    		done[rs]=true;
    		s[rs]=1;
    	}
    	else{ // it opens with 0
    		while(lo<=hi){
    			int mid=(lo+hi)>>1;
    			for(int j=mid;j<N;j++) ss[j]=s[j];
    			for(int j=lo;j<=mid;j++){
    				if(done[j]) ss[j]=s[j];
    				else ss[j]=1;
    			}
    			int rr=tryCombination(ss);
    			if(rr==i){
    				hi=mid-1;
    				rs=mid;
    			}
    			else{
    				lo=mid+1;
    			}
    		}
    		d[rs]=i;
    		done[rs]=true;
    		s[rs]=0;
    	}
    }
    answer(s,d);
}

Compilation message (stderr)

cave.cpp: In function 'void exploreCave(int)':
cave.cpp:35:12: warning: 'rs' may be used uninitialized in this function [-Wmaybe-uninitialized]
       d[rs]=i;
       ~~~~~^~

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