0_0_2770294_25695.c:4: error: syntax error before "f"
0_0_2770294_25695.c: In function `dfs':
0_0_2770294_25695.c:23: error: `true' undeclared (first use in this function)
0_0_2770294_25695.c:23: error: (Each undeclared identifier is reported only once
0_0_2770294_25695.c:23: error: for each function it appears in.)
0_0_2770294_25695.c:25: error: `false' undeclared (first use in this function)
0_0_2770294_25695.c: In function `main':
0_0_2770294_25695.c:36: error: `true' undeclared (first use in this function)
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