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#include <iostream>

#include <math.h>

using namespace std;

double uniform(double min, double max) {

return rand() / (RAND_MAX + 1.0) * (max - min) + min;

}

int binomial(int n, double p) {

if(p < 0 || p > 1) return 0;

int c = 0;

double r;

for(int i=0; i<n; i++) {

r = rand() / (RAND_MAX + 1.0);

if (r < p) c++;

}

return c;

}

double sigmoid(double x) {

return 1.0 / (1.0 + exp(-x));

}