[Init] Solved solutions

cpp/158B.cpp

@@ -0,0 +1,59 @@
+#include <iostream>
+
+using namespace std;
+
+int main()
+{
+    int n;
+    cin >> n;
+    int a[4];
+    for (int i = 0; i < 4; i++)
+    {
+        a[i] = 0;
+    }
+    for (int i = 0; i < n; i++)
+    {
+        int t;
+        cin >> t;
+        switch (t)
+        {
+        case 1:
+            a[0]++;
+            break;
+        case 2:
+            a[1]++;
+            break;
+        case 3:
+            a[2]++;
+            break;
+        case 4:
+            a[3]++;
+            break;
+        }
+    }
+    int count = 0;
+    int s = 0;
+    count += a[3];
+    count += a[2];
+    if (a[0] >= a[2])
+    {
+        a[0] -= a[2];
+    }
+    else
+    {
+        a[0] = 0;
+    }
+    count += a[1]/2;
+    a[1] %= 2;
+    s += a[1]*2 + a[0];
+    if (s%4)
+    {
+        count += (s/4 + 1);
+    }
+    else
+    {
+        count += s/4;
+    }
+    cout << count << endl;
+    return 0;
+}