initial commit

525A Vitaliy and Pie/525A.cpp

@@ -0,0 +1,42 @@
+#include<bits/stdc++.h>
+using namespace std;
+using ll = long long;
+
+void solve()
+{
+    int n;
+    cin>>n;
+    string s;
+    cin>>s;
+    unordered_map<char,int>m;
+    int ct=0;
+    for(int i=0; i<s.size(); ++i)
+    {
+        if(s[i]>='a' && s[i]<='z')
+        {
+            m[s[i]]++;
+        }
+        else
+        {
+            char c;
+            c=tolower(s[i]);
+            if(m[c]>0)
+            {
+                m[c]--;
+            }
+            else ct++;
+        }
+    }
+    cout<<ct<<endl;
+}
+
+int main()
+{
+    ios_base::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    int TC = 1;
+    //cin >> TC;
+    //cin.ignore();
+    while (TC--) solve();
+}