Compilare: main.cpp: In function 'int main()': main.cpp:19:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < v.size(); i++ ){ ~~^~~~~~~~~~ main.cpp:20:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < v.size(); j++ ){ ~~^~~~~~~~~~ main.cpp:30:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < elemente_2.size() && ok == 1 ; i++ ){ ~~^~~~~~~~~~~~~~~~~~~ main.cpp:31:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < elemente_2.size() && ok == 1 ; j++ ){ ~~^~~~~~~~~~~~~~~~~~~ main.cpp:32:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int k = 0; k < elemente_2.size() && ok == 1; k++ ){ ~~^~~~~~~~~~~~~~~~~~~