제출 #639188

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
639188		Pietra	Mobile (BOI12_mobile)	C++14	0 / 100	411 ms	16612 KiB

mobile

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

const int maxn = 1e6 + 5 ;
const double inf = 2e9 ;

double n ;
double l, x[maxn], y[maxn] ;

bool check(double r){

    double f = 0 ;

    for(int i = 1 ; i <= n ; i++){
        if(r < y[i]) return 0 ;
        double dx = sqrt((r*r) - (y[i]*y[i])) ;
        double ini = x[i] - dx, fim = x[i] + dx ;
        if(ini <= f) f = max(f, fim) ;
    }

    return (f >= l) ;

}

int main(){

    scanf("%lf%lf", &n, &l) ;

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

    double ini = 0, fim = inf, mid, best = -1 ;
    int it = 45 ;

    while(it--){
        mid = (ini + fim)/2 ;
       // printf("%.3lf\n", mid) ;
        if(check(mid)) best = mid, fim = mid ;
        else ini = mid ;
    }

    cout << fixed << setprecision(3) << best << "\n" ;
    //printf("%.3lf\n", best) ;

}

컴파일 시 표준 에러 (stderr) 메시지

mobile.cpp: In function 'int main()':
mobile.cpp:27:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |     scanf("%lf%lf", &n, &l) ;
      |     ~~~~~^~~~~~~~~~~~~~~~~~
mobile.cpp:29:40: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |     for(int i = 1 ; i <= n ; i++) scanf("%lf%lf", &x[i], &y[i]) ;
      |                                   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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