Codeforces-SolutionsA/525A Vitaliy and Pie/525A.cpp

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2023-06-28 04:18:19 +08:00
#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();
}