Compilare: user.cpp: In function ‘void write()’: user.cpp:95:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < output.size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:120:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j + add < g[i].vec.size(); j++){ ^