POJ-1005: I Think I Need a Houseboat 详解1: 直接计算

> 分析

>> 本题主要在于理解题意

>> 半圆的范围在多少年内会包含给的坐标

> 注意

>> 算式一口气会稍微快一点

> 附代码

 1 #include "stdio.h"
 2
 3 #define PI 3.14f
 4
 5 int main(void)
 6 {
 7     int n = 0 ;
 8     int i = 0 ;
 9     float x = 0.0, y = 0.0;
10     int years = 0 ;
11
12     scanf("%d", &n) ;
13
14     for(i = 0; i < n; i++)
15     {
16         scanf("%f %f", &x, &y) ;
17         years = (int)(PI * (x * x + y * y) / 2 / 50) + 1;
18
19         printf("Property %d: This property will begin eroding in year %d.\r\n",
20             i + 1, years) ;
21     }
22
23     printf("END OF OUTPUT.\r\n") ;
24     return 0 ;
25 }