Submission #380955

#	Time	Username	Problem	Language	Result	Execution time	Memory
380955		Iwanttobreakfree	Finding Routers (IOI20_routers)	C++17	39 / 100	2 ms	1260 KiB

routers

#include "routers.h"
#include <vector>
using namespace std;
vector<int> guarda(100000,-1);
vector<int> find_routers(int lon, int n, int q) {
    vector<int> ans(n);
    ans[0]=0;
    int l=0,r;
    for(int i=1;i<n;i++){
    r=lon;
    int sol;
    while(l<=r){
    	int mid=(r-l)/2+l,cerc;
    	if(guarda[mid]==-1)cerc=guarda[mid]=use_detector(mid);
    	else cerc=guarda[mid];
    	if(cerc<i){
    		l=mid+1;
    		sol=mid;
		}
		else{
			r=mid-1;
		}
	}
	ans[i]=2*sol-ans[i-1];
	l=ans[i];
	}
	return ans;
}

Compilation message (stderr)

routers.cpp: In function 'std::vector<int> find_routers(int, int, int)':
routers.cpp:24:10: warning: 'sol' may be used uninitialized in this function [-Wmaybe-uninitialized]
   24 |  ans[i]=2*sol-ans[i-1];
      |         ~^~~~

• Subtask 1: 16 / 16
• Subtask 2: 0 / 21
• Subtask 3: 23 / 23
• Subtask 4: 0 / 40