View Compilation Error

0_0_12038027_28437.c:2:20: algorithm: No such file or directory
0_0_12038027_28437.c:3: error: syntax error before "namespace"
0_0_12038027_28437.c:8: error: syntax error before "X"
0_0_12038027_28437.c: In function `cmp':
0_0_12038027_28437.c:10: error: `X' undeclared (first use in this function)
0_0_12038027_28437.c:10: error: (Each undeclared identifier is reported only once
0_0_12038027_28437.c:10: error: for each function it appears in.)
0_0_12038027_28437.c:10: error: `Y' undeclared (first use in this function)