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xchg a,b
for (int i = 0; i < 100000000; i++) {
x1 ^= y1;
y1 ^= x1;
x1 ^= y1;
}
for (int i = 0; i < 100000000; i++) {
x2 = x2 + y2;
y2 = x2 - y2;
x2 = x2 - y2;
}
int temp = 0;
for (int i = 0; i < 100000000; i++) {
temp = y3;
y3 = x3;
x3 = temp;
}