Compilare: main.cpp: In function 'void adaugare(pereche)': main.cpp:25:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < a[linie].size() && stop == 0; ++i ) { ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:69:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( lg < a[i].size() ) { ~~~^~~~~~~~~~~~~ main.cpp:83:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( a[j].size() > i ) { ~~~~~~~~~~~~^~~ main.cpp:99:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( a[j].size() > i ) { ~~~~~~~~~~~~^~~