View Compilation Error

0_0_1365467_8392.c:2:19: iostream: No such file or directory
0_0_1365467_8392.c:3: error: syntax error before "namespace"
0_0_1365467_8392.c:4: error: syntax error before "hash"
0_0_1365467_8392.c: In function `main':
0_0_1365467_8392.c:23: error: `maxn' undeclared (first use in this function)
0_0_1365467_8392.c:23: error: (Each undeclared identifier is reported only once
0_0_1365467_8392.c:23: error: for each function it appears in.)