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Problem Statement

Swap two integers without using a third variable.

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Solution

#include <stdio.h>

int main() {
    int a, b;
    scanf("%d %d", &a, &b);
    a = a + b;
    b = a - b;
    a = a - b;
    printf("a = %d, b = %d\n", a, b);
    return 0;
}

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Input

10 20

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Output

a = 20, b = 10