Compilare: main.cpp: In function 'int main()': main.cpp:17:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a.size(); i++) ~~^~~~~~~~~~ main.cpp:26:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < b.size(); i++) mi = min(mi, f[b[i] - 'a']); ~~^~~~~~~~~~ main.cpp:32:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k = 0; k < b.size(); k++) ~~^~~~~~~~~~ main.cpp:37:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(it + med - 1 >= v[b[k] - 'a'].size()) break; ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:39:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos >= a.size()) break; ~~~~^~~~~~~~~~~ main.cpp:41:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k == b.size()) last = med, st = med + 1; ~~^~~~~~~~~~~ main.cpp:13:19: warning: unused variable 'ct' [-Wunused-variable] int n, q, mi, ct, pos, k, st, dr, med, it, last; ^~