Compilare: main.cpp: In function 'int Check()': main.cpp:18:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < V.size(); ++i ) ~~^~~~~~~~~~ main.cpp:19:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = i + 1; j < V.size(); ++j ) ~~^~~~~~~~~~ main.cpp:20:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int k = j + 1; k < V.size(); ++k ) { ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < V.size(); ++i ) ~~^~~~~~~~~~