0_0_8938048_29757.cpp: In function `int main()':
0_0_8938048_29757.cpp:7: error: `cin' undeclared (first use this function)
0_0_8938048_29757.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8938048_29757.cpp:13: error: `swap' undeclared (first use this function)
0_0_8938048_29757.cpp:19: error: `cout' undeclared (first use this function)
0_0_8938048_29757.cpp:19: error: `endl' undeclared (first use this function)
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