Codeforces 546A. Soldier and Bananas Question
A. Soldier and Bananas
A soldier wants to buy w bananas in the shop. He has to pay k dollars for the first banana, 2k dollars for the second one and so on (in other words, he has to pay i·k dollars for the i-th banana).
He has n dollars. How many dollars does he have to borrow from his friend soldier to buy w bananas?
Input
The first line contains three positive integers k, n, w (1 ≤ k, w ≤ 1000, 0 ≤ n ≤ 109), the cost of the first banana, initial number of dollars the soldier has and number of bananas he wants.
Output
Output one integer — the amount of dollars that the soldier must borrow from his friend. If he doesn’t have to borrow money, output 0.
Examples
input:
3 17 4
output:
13
Codeforces 546A Soldier and Bananas solution in C++
#include<iostream>
using namespace std;
int main()
{
int w,k,z;
long long int n;
cin>>k>>n>>w;
int sum=0;
for(int i=1;i<=w;i++)
{
sum=sum+i;
}
int m=sum*k;
int out=m-n;
if(out<0)
{
cout<<"0"<<endl;
}
else{
cout<<out<<endl;}
}
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