View Compilation Error

0_0_2272373_32125.c:2:21: algorithm: No such file or directory
0_0_2272373_32125.c:3:15: set: No such file or directory
0_0_2272373_32125.c:4: error: syntax error before "namespace"
0_0_2272373_32125.c: In function `get_group':
0_0_2272373_32125.c:27: error: `set' undeclared (first use in this function)
0_0_2272373_32125.c:27: error: (Each undeclared identifier is reported only once
0_0_2272373_32125.c:27: error: for each function it appears in.)
0_0_2272373_32125.c:27: error: syntax error before "int"
0_0_2272373_32125.c:31: error: `group' undeclared (first use in this function)
0_0_2272373_32125.c: In function `main':
0_0_2272373_32125.c:47: error: 'for' loop initial declaration used outside C99 mode