Compilare: main.cpp: In function 'void Do()': main.cpp:36:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < ord.size(); ++i ) { ~~^~~~~~~~~~~~ main.cpp:41:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < V.size(); ++i ) ~~^~~~~~~~~~ main.cpp:42:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < V[i].size(); ++j ) ~~^~~~~~~~~~~~~ main.cpp:47:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < V.size(); ++i ) ~~^~~~~~~~~~ main.cpp:48:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < V[i].size(); ++j ) ~~^~~~~~~~~~~~~ main.cpp:54:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < V.size(); ++i ) ~~^~~~~~~~~~ main.cpp:61:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < V.size(); ++i ) ~~^~~~~~~~~~