Compilare: main.cpp: In function 'void afisare()': main.cpp:32:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < op[i].size(); ++j) ~~^~~~~~~~~~~~~~ main.cpp: In function 'void rezolvare()': main.cpp:50:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v[linie - 1].size(); ++j) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:70:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v[linie].size(); ++j) ~~^~~~~~~~~~~~~~~~~ main.cpp:95:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v[linie - 1].size(); ++j) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:104:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v[linie].size(); ++j) ~~^~~~~~~~~~~~~~~~~