0_0_11540112_7514.cpp: In function `void spfa()':
0_0_11540112_7514.cpp:45: error: `w' undeclared (first use this function)
0_0_11540112_7514.cpp:45: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11540112_7514.cpp:46: error: expected `;' before "if"
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