Compilare: main.cpp: In function 'int32_t main()': main.cpp:132:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int f=0; f<o0[i][j].size(); f++){ ~^~~~~~~~~~~~~~~~ main.cpp:175:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int f=0; f<o0[i][j].size(); f++){ ~^~~~~~~~~~~~~~~~ main.cpp:208:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int f=0; f<o0[i][j].size(); f++){ ~^~~~~~~~~~~~~~~~