foo.cc: In function 'int pfh(int, int)':
foo.cc:71:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
foo.cc: In function 'void dijkstra()':
foo.cc:43:19: warning: 'minp' may be used uninitialized in this function [-Wmaybe-uninitialized]
         node[minp]=true;
         ~~~~~~~~~~^~~~~

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