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Birthday.java
47 lines (42 loc) · 1.27 KB
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Birthday.java
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public class Birthday
{
public static void main(String[] args)
{
int n = Integer.parseInt(args[0]);
int trials = Integer.parseInt(args[1]);
double[][] matrix = new double[n+1][3];
for (int i = 0; i < (n+1); i++)
matrix[i][0] = (i+1);
for (int j = 0; j < trials; j++)
{
int numPeople = 0;
boolean[] found = new boolean[n];
int birth = (int) (Math.random() * n);
while (!found[birth])
{
found[birth] = true;
birth = (int) (Math.random() * n);
numPeople += 1;
}
matrix[numPeople][1] += 1;
}
double total = 0;
for (int p = 0; p <= n; p++)
{
total += matrix[p][1];
matrix[p][2] = total/trials;
}
int t = 0;
while(matrix[t][2] < 0.5) t+= 1;
t += 1;
for (int m = 0; m < t; m++)
{
int first = (int) matrix[m][0];
int second = (int) matrix[m][1];
if (first < 10)
System.out.println(first + " " + second + " " + matrix[m][2]);
else
System.out.println(first + " " + second + " " + matrix[m][2]);
}
}
}