feat: day 20 solution

Easy/Day 20/solution.cpp

@@ -1 +1,24 @@
-// Write your code here.
+// Write your code here.
+#include <bits/stdc++.h>
+using namespace std;
+
+int main(){
+    int n,x;
+    cin>>n>>x;
+    string s;
+    cin>>s;
+    for (int i = 0; i<n; i++){
+        if(x>0 && s[i] == 'x'){
+            x--;
+        }
+        else if(x>=0 && s[i] == 'o'){
+            x++;
+        }
+
+    }
+    cout<<x<<endl;
+
+
+
+    return 0;
+}