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String reverse with time complexity of n/2 with out using
temporary variable.

Answer Posted / manish pathak

//********this is perfect answer***************

#include<stdio.h>
#include<conio.h>
void main()
{
int i,j,n,num,rem,l;
char s[]="abcde";
l=sizeof(s)-1;
for(i=0,j=l-1;i<=(l-1)/2;i++)//save space n/2
{

s[i]=s[i]+s[j-i];
s[j-i]=s[i]-s[j-i];
s[i]=s[i]-s[j-i];

}

s[l]='\0';
printf("%s",s);
getch();
}

Is This Answer Correct ?    5 Yes 1 No



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