0_0_1417189_13294.c:65: error: syntax error before '&' token
0_0_1417189_13294.c: In function `swap':
0_0_1417189_13294.c:67: error: `x' undeclared (first use in this function)
0_0_1417189_13294.c:67: error: (Each undeclared identifier is reported only once
0_0_1417189_13294.c:67: error: for each function it appears in.)
0_0_1417189_13294.c:68: error: `y' undeclared (first use in this function)
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