foo.cc: In function 'void Floyd()':
foo.cc:3:12: error: 'n' was not declared in this scope
    3 | for(k=1;k<=n;k++)
      |            ^
foo.cc:6:4: error: 'dist' was not declared in this scope
    6 | if(dist[i][k]+dist[k][j]<dist[i][j])
      |    ^~~~

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