Compilare: user.cpp: In function ‘void ve(int, int)’: user.cpp:29:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<x[poz-1].size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:54:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<x[i-1].size();j++) ^ user.cpp:77:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<x[k].size();j++) ^ user.cpp:84:12: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] ve(k,c); ^