Compilare: user.cpp: In function ‘void fillcost()’: user.cpp:45:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int st = 0; st < word.size(); ++st ) ^ user.cpp:46:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int dr = st; dr < word.size(); ++dr ) ^ user.cpp: In function ‘void rez()’: user.cpp:86:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int lim = 2; lim <= word.size(); ++lim ) ^ user.cpp:87:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int st = 0; st+lim-1 < word.size(); ++st ) ^ user.cpp: In function ‘void solve2()’: user.cpp:110:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < word.size(); ++i ) pos[word[i]-'A'] = i; ^