View Compilation Error

112319_0_12835.c:1:20: iostream: No such file or directory
112319_0_12835.c:2: error: syntax error before "namespace"
112319_0_12835.c:6: error: syntax error before "key"
112319_0_12835.c:8: error: syntax error before "flag1"
112319_0_12835.c: In function `dfs':
112319_0_12835.c:18: error: 'for' loop initial declaration used outside C99 mode
112319_0_12835.c: In function `main':
112319_0_12835.c:36: error: `EOF' undeclared (first use in this function)
112319_0_12835.c:36: error: (Each undeclared identifier is reported only once
112319_0_12835.c:36: error: for each function it appears in.)