/in/foo.cc: In function 'int Solve()':
/in/foo.cc:79:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |                 for( int i = 0 ; i < Graph[ u ].size( ) ; i ++ ) vt[ Graph[ u ][ i ].v ] = Graph[ u ][ i ].w;
      |                                  ~~^~~~~~~~~~~~~~~~~~~~
/in/foo.cc:80:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   80 |                 for( int i = 0 ; i < Graph[ u ].size( ) ; i ++ ) {
      |                                  ~~^~~~~~~~~~~~~~~~~~~~
/in/foo.cc:83:44: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   83 |                         for( int j = 0 ; j < Graph[ v ].size( ) ; j ++ ) {
      |                                          ~~^~~~~~~~~~~~~~~~~~~~
/in/foo.cc:92:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   92 |                 for( int i = 0 ; i < Graph[ u ].size( ) ; i ++ ) vt[ Graph[ u ][ i ].v ] = 0;
      |                                  ~~^~~~~~~~~~~~~~~~~~~~