0_0_21765589_2959.cpp: In function 'bool spfa(int, int)':
0_0_21765589_2959.cpp:40:16: error: 'fa' was not declared in this scope
vis[i]=fa
^
0_0_21765589_2959.cpp:40:16: error: expected '}' at end of input
0_0_21765589_2959.cpp:40:16: error: expected '}' at end of input
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