Compilare: main.cpp: In function 'int main()': main.cpp:48:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=vec.size()-1;i++){ ~^~~~~~~~~~~~~~ main.cpp:49:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<vec[i].size();j++){ ~^~~~~~~~~~~~~~ main.cpp:51:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int q=0;q<vec[i].size();q++){ ~^~~~~~~~~~~~~~ main.cpp:38:9: warning: unused variable 'ccc' [-Wunused-variable] int ccc=1; ^~~