Help me in solving LJAJAG21 problem

help
,
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My issue

What is going wrong in code

My code

#include <stdio.h>

int main() {
    int a, b, temp;

    // Input two variables
    printf("Enter two numbers: ");
    scanf("%d %d", &a, &b);

    // Swapping using a third variable
    temp = a;
    a = b;
    b = temp;
    printf("Using third variable: %d %d\n", a, b);

    // Reinitializing the values for the second case
    printf("Enter two numbers again: ");
    scanf("%d %d", &a, &b);

    // Swapping without using a third variable
    a = a + b;
    b = a - b;
    a = a - b;
    printf("Without using third variable: %d %d\n", a, b);

    return 0;
}

Learning course: Learn C Programming
Problem Link: https://www.codechef.com/learn/course/rcpit-programming-c/RCPITLPC07/problems/LJAJAG21