Submission #576209

#	Time	Username	Problem	Language	Result	Execution time	Memory
576209		Pietra	Sure Bet (CEOI17_sure)	C++14	60 / 100	91 ms	8028 KiB

sure

#include<bits/stdc++.h>
using namespace std ; 

const int maxn = 1e5 + 5 ; 

int n ; 
double x[maxn], y[maxn], p_x[maxn], p_y[maxn] ; 

bool cmp(double a, double b){ return a >= b ; }

int main(){

	scanf("%d",&n) ; 

	for(int i = 1 ; i <= n ; i++) scanf("%lf%lf", &x[i],&y[i]) ;  

	sort(x + 1, x + 1 + n, cmp) ; sort(y + 1, y + 1 + n, cmp) ; 
    
    for(int i = 1 ; i <= n ; i++) p_x[i] = p_x[i-1] + x[i], p_y[i] = p_y[i-1] + y[i] ; 

   	double ans = 0 ; 

    for(int i = 1 ; i <= n ; i++){
    	int ini = 1, fim = n, mid, best = 0 ; double mn = p_x[i] ; 
    	while(ini <= fim){
    		mid = (ini + fim)>>1 ; 
    		if(p_x[i] - mid - i < p_y[mid] - mid - i) fim = mid - 1 ; 
    		else ini = mid + 1 ; 
    		if(abs((p_x[i] - mid - i)-(p_y[mid] - mid - i)) <= mn){
    			mn = abs((p_x[i] - mid - i)-(p_y[mid] - mid - i)) ; 
    			best = mid ; 
    		}
    	}
    	ans = max(ans, min(p_x[i] - (double)best - (double)i, p_y[best] - (double)i - (double)best)) ; 
    }

    printf("%.4lf\n", ans) ; 

}

Compilation message (stderr)

sure.cpp: In function 'int main()':
sure.cpp:13:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |  scanf("%d",&n) ;
      |  ~~~~~^~~~~~~~~
sure.cpp:15:37: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |  for(int i = 1 ; i <= n ; i++) scanf("%lf%lf", &x[i],&y[i]) ;
      |                                ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 0 / 40