Compilare: main.cpp: In function 'int main()': main.cpp:43:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < components.size() - 1; i ++ ) { ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:54:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( a < components.size() && components[a][b] == -1 ) { ~~^~~~~~~~~~~~~~~~~~~ main.cpp:56:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( b == components[a].size() ) ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:59:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( a == components.size() ) { ~~^~~~~~~~~~~~~~~~~~~~