Contest3147 - game 38 of 2021 Freshmen's personal training match_ 1: Maximum palindromes

//
#include<bits/stdc++.h>
using namespace std;

const int MAXN=44;
char str[MAXN],ans[MAXN];
int anslen;         //  Redefinition of global variables   

void init()
{
    anslen=0;
    memset( str,0,sizeof( str ) );
    memset( ans,0,sizeof( ans ) );
}

bool judge()
{
    char *p1=str;
    char *p2=str+strlen(str)-1;
    
    while( p1<p2 )
    {
        if( *p1!=*p2 ) return false;
        p1++; p2--;         // 
    }
    return true;
}

void update()
{
    int slen=strlen(str);   // strlen  name conflict 

    if( slen>anslen ) anslen=slen,strcpy( ans,str );
    else if( slen==anslen )
    {
        if( strcmp( str,ans )>0 ) anslen=slen,strcpy( ans,str);
    }
}

int main()
{
    int n;

    while( ~scanf("%d",&n) )
    {
        init();
        while( n-- )
        {
            scanf("%s",str);
            if( judge() ) update();
        }
        printf("%s\n",ans);
    }
    return 0;
}

//
find:
01  forget  memcpy strncpy  The use of 
02  String always forgets when using first and last pointers   displacement 
03 str  Character array  len  name   Be careful and  strlen  name conflict