Changed the folder structure of codeforces problemsets

codeforces/problemsets/taxi/a.cpp

@@ -0,0 +1,47 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main(){
+    ios::sync_with_stdio(0);
+    cin.tie(0);
+
+    int n, a, result = 0, ones = 0, twos = 0, threes = 0;
+    cin >> n;
+
+    for(int i = 0; i < n; i++){
+        cin >> a;
+        if(a != 4){
+            if(a == 1){
+                ones++;
+            } else if(a == 2){
+                twos++;
+            } else{
+                threes++;
+            }
+        } else{
+            result++;
+        }
+    }
+
+    int onethreegroups = min(ones, threes);
+    result += threes;
+    ones -= onethreegroups;
+
+    int doubletwos = twos / 2;
+    result += doubletwos;
+    twos -= doubletwos * 2;
+
+    if(twos == 1){
+        result++;
+        ones -= min(2, ones);
+    }
+
+    result += ceil((float)ones / 4);
+
+    cout << result;
+
+    cout << flush;
+
+    return 0;
+}