p30, C++ (gcc) - rextester

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//Title of this code
//gcc 4.8.2

#include <stdio.h>
#define MAXLINE 1000 /* maximum input line length */
int getline(char line[], int maxline);
void copy(char to[], char from[]);

int getline(char s[], int lim)
    {
    int c,i;
        for(i=0;i<lim-1 && (c=getchar())!=EOF && c!='\n';i++ ){s[i]=c;}
       // ++i;
        s[i]='\0';
    return i;
    
}

void copy(char lgst[],char l[])
 {
    int i;
    for(i=0;l[i]!= '\0';i++){lgst[i]=l[i];//printf("%d",longest[i]);
                            }
        //printf('\n');
   // l[i]="\0";
}
 int main(void)
{
    
    int max=0,apel=0;
   char line[MAXLINE];//current 
   char longest[MAXLINE];
    
    //---------------------------------------
    while((apel=getline(line ,MAXLINE)) > 0)
        if(max<=apel){max=apel;
 
                    copy(longest,line);
                    }
    // else  printf("%s",longest);
      for(int i=0;longest[i]!= '\0' && longest[i]!= '\n';i++)printf("%c",longest[i]);
    
    //---------------------------------------
   
       //
   
    
  //---------------------------------------

return 0;
    
  
}

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Compilation time: 0.24 sec, absolute running time: 0.15 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0.41 sec