View Compilation Error

0_0_12314791_784.c:2:21: algorithm: No such file or directory
0_0_12314791_784.c:3: error: syntax error before "namespace"
0_0_12314791_784.c:8: error: syntax error before "x"
0_0_12314791_784.c: In function `cmp':
0_0_12314791_784.c:10: error: `x' undeclared (first use in this function)
0_0_12314791_784.c:10: error: (Each undeclared identifier is reported only once
0_0_12314791_784.c:10: error: for each function it appears in.)
0_0_12314791_784.c:10: error: `y' undeclared (first use in this function)