Compilare: main.cpp: In function 'void BFS()': main.cpp:14:9: warning: unused variable 'i' [-Wunused-variable] int i; ^ main.cpp: In function 'int main()': main.cpp:50:4: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(auto it : sol) ^~~ main.cpp:52:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' return 0; ^~~~~~