0_0_7419598_21615.c:7: error: syntax error before "flag"
0_0_7419598_21615.c: In function `DFS':
0_0_7419598_21615.c:12: error: `true' undeclared (first use in this function)
0_0_7419598_21615.c:12: error: (Each undeclared identifier is reported only once
0_0_7419598_21615.c:12: error: for each function it appears in.)
0_0_7419598_21615.c: In function `main':
0_0_7419598_21615.c:56: error: `false' undeclared (first use in this function)
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