Compilare: main.cpp: In function 'void Read()': main.cpp:25:7: warning: unused variable 'a' [-Wunused-variable] int a, b; ^ main.cpp:25:10: warning: unused variable 'b' [-Wunused-variable] int a, b; ^ main.cpp: In function 'void BFS(int)': main.cpp:56:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < intersect[u].size(); ++i ) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void Do()': main.cpp:82:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for( int i = 1; i <= M; ++i ) ^~~ main.cpp:93:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' if( task == 1 ) ^~