close
https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=1111
#include <iostream>
using namespace std;
int main()
{
long long int S,D;
long long int area;
while(cin >> S >> D) {
for(int i = 0; ; i++) {
area = (S + (S + i)) * (i + 1) / 2;
if(area >= D) {
cout << S + i << endl;
break;
}
}
}
return 0;
}
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