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0_0_6975250_22798.c:1:20: iostream: No such file or directory
0_0_6975250_22798.c:2:18: cstdio: No such file or directory
0_0_6975250_22798.c:5: error: syntax error before "namespace"
0_0_6975250_22798.c: In function `dfs':
0_0_6975250_22798.c:15: error: 'for' loop initial declaration used outside C99 mode
0_0_6975250_22798.c:23: error: 'for' loop initial declaration used outside C99 mode