Palindromi

#include<bits/stdc++.h>
using namespace std;
 
#define debug(x) cout << #x << " = " << x << "\n";
 
typedef long long ll;
typedef vector<ll> vi;
typedef pair<ll,ll> pi;
 
const ll M = 1000000007; 
 
void solve(){
    string s; cin >> s;
    int a=0, b=s.length()-1, ans=0;
    while(a<b){
        if(s[a] != s[b]) ans++;
        a++; b--;
    }
    cout << ans;
}
 
int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
 
    solve();
    return 0;
}

Test 1 (public)

Verdict: ACCEPTED

Test 2 (public)

Verdict: ACCEPTED

Test 3 (public)

Verdict: ACCEPTED

Test 4 (public)

Verdict: ACCEPTED

Test 5 (public)

Verdict: ACCEPTED

Test 6 (public)

Verdict: ACCEPTED

Test 7 (public)

Verdict: ACCEPTED

Test 8 (public)

Verdict: ACCEPTED

Test 9 (public)

Verdict: ACCEPTED

Test 10 (public)

Verdict: ACCEPTED