Compilare: main.cpp: In function 'int main()': main.cpp:26:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<In[i].size();j++){ ~^~~~~~~~~~~~~ main.cpp:27:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k=0;k<Out[i].size();k++){ ~^~~~~~~~~~~~~~