0_0_11037673_17011.c: In function `spfa':
0_0_11037673_17011.c:20: error: `flag' undeclared (first use in this function)
0_0_11037673_17011.c:20: error: (Each undeclared identifier is reported only once
0_0_11037673_17011.c:20: error: for each function it appears in.)
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