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0_0_1214271_20804.c:1:17: cstdio: No such file or directory
0_0_1214271_20804.c:2:18: cstdlib: No such file or directory
0_0_1214271_20804.c:3: error: syntax error before "ok"
0_0_1214271_20804.c: In function `dfs':
0_0_1214271_20804.c:25: error: 'for' loop initial declaration used outside C99 mode
0_0_1214271_20804.c:38: error: 'for' loop initial declaration used outside C99 mode