HackerEarth Xsquare And Palindromes Insertion problem solution

In this HackerEarth Xsquare And Palindromes Insertion problem solution Xsquare likes strings a lot but much more, he likes palindromic strings. Today, he has a string S consisting of lower case English letters. Xsquare wants to convert his string S to a palindromic string. For the above purpose to be served, he can insert as many characters ( possibly zero ) as he wants in his string S such that characters in the new string S can be shuffled to make it a palindrome.

Xsquare is in hurry. Therefore, he wants to accomplish this task with the minimum possible number of insertions in his original string S.

HackerEarth Xsquare And Palindromes Insertion problem solution.

#include <bits/stdc++.h>
using namespace std ;
#define LL long long int
#define ft first
#define sd second
#define PII pair<int,int>
#define MAXN 100005
#define MAXM 10000001
#define mp make_pair
#define f_in(st) freopen(st,"r",stdin)
#define f_out(st) freopen(st,"w",stdout)
#define sc(x) scanf("%d",&x)
#define scll(x) scanf("%lld",&x)
#define pr(x) printf("%dn",x)
#define pb push_back
#define MOD 1000000007
#define MAX 1000010
#define ull long long
#define prime 37
#define pb push_back
#define ASST(x,y,z) assert(x >= y && x <= z)

int t , n;
string s ;
int main(){
    sc(t) ;
    ASST(t,1,100) ;
    while(t --){
        cin >> s ;
        n = s.length() ;
        ASST(n,1,1000) ;
        int M[26]={0} , c = 0;
        for(int i=0;i<n;i++) ASST(s[i],'a','z') ;
        for(int i=0;i<n;i++) M[s[i]-'a'] ++ ;
        for(int i=0;i<26;i++) if(M[i]&1) c ++ ;
        pr(max(0,c-1)) ;
    }
    return 0 ;
}

Second solution

#include <bits/stdc++.h>

using namespace std;

int cnt[26];

int main()
{
    int t,n,ans;
    string s;
    cin >> t;
    while ( t-- ) {
        cin >> s;
        ans = 0;
        memset(cnt, 0, sizeof(cnt));
        int n = (int)s.size();
        for ( int i = 0; i < n; i++ ) cnt[s[i]-'a']++;
        for ( int i = 0; i < 26; i++ ) {
            ans += (cnt[i]%2);
        }
        ans--;
        ans = max(ans, 0);
        cout << ans << endl;
    }
    return 0;
}

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