ABC113B.cpp

#include <iostream>
#include <math.h>
using namespace std;
int main(int argc, char const *argv[]) {
  int n;
  double t,a;
  cin>>n>>t>>a;
  double h,tem,min,ans;
  for(int i=1;i<=n;i++){
    cin>>h;
    if(i==1){
      min=abs(a-(t-h*0.006));
      ans=1;
    }else{
      tem=abs(a-(t-h*0.006));
      if(tem<min){
        min=tem;
        ans=i;
      }
    }
  }
  cout<<ans<<endl;
  return 0;
}

This code have Compile Error.
fix:math.h→ cmath