A collection of solutions in programming contest

bmi.cpp

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

/**
  ACM - PNPC
  - BMI
**/
int main() {
    int w, h, bmi = 0;
	cin >> w >> h;
	bmi = w / (h*h);
	
	cout << (bmi >= 25 ? "GO ON A DIET\n" : "YOU ARE TOO THIN\n");
	
    return 0;
}

calc.cpp

#include <bits/stdc++.h>
/**
  Calculate the difference and sum of a single digit number
  - a single digit character converted to integer by subtracting 48
**/
using namespace std;

int main(){
    
   string equation; cin >> equation;
   int ans = 0;
   if(equation[1] == '+'){
        ans = (equation[0]-48) + (equation[2]-48);
   } else {
        ans = (equation[0]-48) - (equation[2]-48);
   }
   cout << ans << endl;
    
    return 0;
}

house.cpp

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
   int t, Hr, Hb, Wb;
   cin >> t;
   while(t--){
	   cin >> Hr >> Hb >> Wb;
	   int dots = Hr;
	   int height = Hr + Hb + 1, width = 4+1+Wb;
	   int roof_len = width-(Hr+Hr);
	   
	   for(int i = 0; i < height; i++){
		   string dimen = "";
		   if(i == 0){
				string r1(Hr,'.');
				dimen += r1;
				
				string r2(roof_len,'_');
				dimen += (r2+r1);
				
		   } else {
			   if(Hr >= 0){
					string r1(Hr,'.');
					dimen += (r1+"/");
					string r2(roof_len,'#');
					dimen += (r2+"\\"+r1);
			   } else if(i < height-3){
				   string r1(2,'.');
				   dimen += (r1+"|");
				   string r2(Wb-1,'.');
				   dimen += (r2 + "|"+r1);
			   } else if(i == height-3){
				   string r1(2,'.');
				   dimen += (r1+"|");
				   string r2(Wb-3,'.');
				   dimen += (r2 + "_.|"+r1);
			   } else if(i == height-2){
				   
				   string r1(2,'.');
				   dimen += (r1+"|");
				   string r2(Wb-4,'.');
				   dimen += (r2 + "|.||"+r1);
			   }else {
				   string r1(2,'.');
				   dimen += (r1+"|");
				   string r2(Wb-4,'_');
				   dimen += (r2 + "|_||"+r1);
			   }
			   roof_len += 2;
		   }
		   Hr--;
		   cout << dimen << endl;
	   }
	   cout << endl;
   }
    return 0;
}