/in/foo.cc: In function 'int main()':
/in/foo.cc:58:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
         for(int j=1;j<=N;j++)
         ^~~
/in/foo.cc:61:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
     SPFA();
     ^~~~