Compilare: main.cpp: In function 'int okey(int, int)': main.cpp:12:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s > mpos[s2[i] - 'a'].size()) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:19:42: warning: unused variable 's' [-Wunused-variable] int n, q, i, j, om = 0, st, dr, mid, s; ^ main.cpp:43:19: warning: 'mid' may be used uninitialized in this function [-Wmaybe-uninitialized] out<<mid<<'\n'; ^~~~