foo.cc: In function 'int dijkstra(int, int)':
foo.cc:27:53: warning: 'u' may be used uninitialized [-Wmaybe-uninitialized]
   27 |                                 if (dist[j] > dist[u] + arr[u][j])
      |                                               ~~~~~~^
foo.cc:7:21: note: 'u' was declared here
    7 |         int s[251], u,dist[251];
      |                     ^

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