#include <iostream>
#include <cmath>
using namespace std;
double rs, rb;
double solve(double S0, int n, int k) {
if (n == 0)
return log(S0);
// k가 전체 과자 개수보다 크다면 작은 과자조각으로 반환
if (k > (1<<n)) {
return solve(S0*rs, n-1, k/2);
}
// 아니면 큰 조각으로 반환
return solve(S0*rb, n-1, k);
}
int main() {
int a, b, n, k;
cin >> a >> b >> n >> k;
if (a > b) swap(a, b);
rs = (double)a*a / (double)(a*a + b*b);
rb = (double)b*b / (double)(a*a + b*b);
double S0 = a*b / 2.0;
printf("%.10f\n", solve(S0, n, k));
}
Compilation message
A.cpp: In function ‘int main()’:
A.cpp:26:38: error: ‘printf’ was not declared in this scope
printf("%.10f\n", solve(S0, n, k));
^
