Compilare: main.cpp: In function 'int main()': main.cpp:45:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[i].size();j++) ~^~~~~~~~~~~~ main.cpp:49:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j < v[i].size()){ ~~^~~~~~~~~~~~~ main.cpp:51:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int t=j;t<v[i].size()-1;t++) ~^~~~~~~~~~~~~~