Compilare: main.cpp: In function 'bool is_somewhere(int)': main.cpp:56:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(q == v[i].size() - 1) ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:129:64: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = v[ord[i]].size() - mat[ord[i - 1]][ord[i]] ; j < v[ord[i]].size() ; j++) ~~^~~~~~~~~~~~~~~~~~ main.cpp:64:16: warning: unused variable 'q' [-Wunused-variable] int i,j,ii,q; ^ main.cpp: In function 'bool is_somewhere(int)': main.cpp:50:20: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized] m = v[j].size() - 1; ^