View Compilation Error

0_0_11212830_21367.c:3:21: algorithm: No such file or directory
0_0_11212830_21367.c:4: error: syntax error before "namespace"
0_0_11212830_21367.c:11: error: syntax error before "a"
0_0_11212830_21367.c: In function `cmp':
0_0_11212830_21367.c:13: error: `a' undeclared (first use in this function)
0_0_11212830_21367.c:13: error: (Each undeclared identifier is reported only once
0_0_11212830_21367.c:13: error: for each function it appears in.)
0_0_11212830_21367.c:13: error: `b' undeclared (first use in this function)
0_0_11212830_21367.c: In function `main':
0_0_11212830_21367.c:39: error: 'for' loop initial declaration used outside C99 mode