[Add] solved solutions

cpp/PRB01.cpp

@@ -0,0 +1,41 @@
+#include <iostream>
+
+#define MAX_SIZE 100000
+
+using namespace std;
+
+int main()
+{
+    bool prime[MAX_SIZE];
+    prime[0] = prime[1] = 0;
+    for (int i = 2; i < MAX_SIZE; i++)
+    {
+        prime[i] = 1;
+    }
+    for (int i = 0; i < MAX_SIZE; i++)
+    {
+        if (prime[i])
+        {
+            for (int j = 2*i; j < MAX_SIZE; j += i)
+            {
+                prime[j] = 0;
+            }
+        }
+    }
+    int t;
+    cin >> t;
+    while (t--)
+    {
+        int n;
+        cin >> n;
+        if (prime[n])
+        {
+            cout << "yes" << endl;
+        }
+        else
+        {
+            cout << "no" << endl;
+        }
+    }
+    return 0;
+}