POJ 3440 Coin Toss(概率)

题目链接

概率问题，像是概率论上学的均匀分布，是不是呢，忘了。。。

概率同面积有关系，我写的各种搓，然后此题格式十分变态，=前有的时候俩空格，有的时候一个空格。代码各种搓。

 #include <cstdio>
 #include <cstring>
 #include <iostream>
 #include <cmath>
 #include <algorithm>
 using namespace std;
 #define PI 3.141592653
 #define eps 1e-9
 int main()
 {
     int t,cas = ;
     double n,m,d,r,S;
     double t11,t12,t13,t14,t21,t22,t23,t24,t31,t32,t33,t34;
     double a1,a2,a3,a4;
     scanf("%d",&t);
     while(t--)
     {
         scanf("%lf%lf%lf%lf",&n,&m,&d,&r);
         S = n*m*d*d;
         t11 = (d-r/)*(d-r/);
         t12 = *(d-r/)*r/;
         t13 = 0.25*PI*(r/)*(r/);
         t14 = (r/)*(r/) - t13;
         t21 = (d-r/)*(d-r);
         t22 = (d-r/)*r + (d-r)*r/;
         t23 = 0.5*PI*(r/)*(r/);
         t24 = *(r/)*(r/) - t23;
         t31 = (d-r)*(d-r);
         t32 = *(d-r)*r/;
         t33 = PI*(r/)*(r/);
         t34 = r*r - t33;
         if(n == &&m == )
         {
             a1 = S;
             a2 = ;
             a3 = ;
             a4 = ;
         }
         else if(n == )
         {
             a1 = *(d-r/)*d + (m-)*(d-r)*d;
             a2 = S - a1;
             a3 = ;
             a4 = ;
         }
         else if(m == )
         {
             a1 = *(d-r/)*d + (n-)*(d-r)*d;
             a2 = S - a1;
             a3 = ;
             a4 = ;
         }
         else
         {
             a1 = *t11 + *(n-+m-)*t21 + (n-)*(m-)*t31;
             a2 = *t12 + *(n-+m-)*t22 + (n-)*(m-)*t32;
             a3 = *t13 + *(n-+m-)*t23 + (n-)*(m-)*t33;
             a4 = *t14 + *(n-+m-)*t24 + (n-)*(m-)*t34;
         }
         printf("Case %d:\n",cas++);
         printf("Probability of covering 1 tile  = %.4f%%\n",a1*/S);
         printf("Probability of covering 2 tiles = %.4f%%\n",a2*/S);
         printf("Probability of covering 3 tiles = %.4f%%\n",a4*/S);
         printf("Probability of covering 4 tiles = %.4f%%\n",a3*/S);
         printf("\n");
     }
     return ;
 }