0_0_6760149_20652.cpp: In function `bool check()':
0_0_6760149_20652.cpp:9: error: non-lvalue in assignment
0_0_6760149_20652.cpp:10: error: `swap' undeclared (first use this function)
0_0_6760149_20652.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)
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