Compilare: main.cpp: In function 'int main()': main.cpp:37:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < v[i].size() ; j++) ~~^~~~~~~~~~~~~ main.cpp:39:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(o = 0 ; o < nc[i].size() ; o++) ~~^~~~~~~~~~~~~~ main.cpp:65:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < v[i].size() ; j++) ~~^~~~~~~~~~~~~ main.cpp:66:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j < nc[i].size()) ~~^~~~~~~~~~~~~~