#define swap1(x,y) {x = x ^ y; y = x ^ y; x = x ^ y;}
#define swap2(x,y) {x = x + y; y = x - y; x = x - y;}
#define swap1(x,y) {x = x ^ y; y = x ^ y; x = x ^ y;}
#define swap2(x,y) {x = x + y; y = x - y; x = x - y;}
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