OJ-Problems-Source/HDOJ/1408_autoAC.cpp

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#include <iostream>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;
int main()
{
int i, j, k, N;
double vl, d;
while (scanf("%lf%lf", &vl, &d) == 2) {
double dd = (int) ceil(vl / d);
int n = (int) (sqrt(2 * dd + 0.25) - 0.5001);
printf("%d\n", (int) dd + n);
}
return 0;
}