杭电ACM1071The area---------求积分面积
[cpp]#include <iostream>#include <stdio.h>using namespace std;int main(){ int t;double x1,y1,x2,y2,x3,y3,a,k,s;cin>>t;while(t--){ cin>>x1>>y1>>x2>>y2>>x3>>y3;a=(y2-y1)/((x2-x1)*(x2-x1));k=(y2-y3)/(x2-x3);s=a/3*(x3*x3*x3-x2*x2*x2)+(a*x1*x1+k*x3+y1-y3)*(x3-x2)+0.5*(2*a*x1+k)*(x2*x2-x3*x3);printf("%.2f\n",s);}return 0;}
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