Compilare: user.cpp: In function ‘void fillcost()’: user.cpp:53:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int st = 0; st < word.size(); ++st ) ^ user.cpp:54:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int dr = st; dr < word.size(); ++dr ) ^ user.cpp: In function ‘void litere()’: user.cpp:88:55: warning: array subscript has type ‘char’ [-Wchar-subscripts] dp[i][j][pos[v[i][j]-'A']][pos[v[i][j]]-'A'] = 0; ^ user.cpp:89:74: warning: array subscript has type ‘char’ [-Wchar-subscripts] heap.push({{i, j}, dp[i][j][pos[v[i][j]-'A']][pos[v[i][j]]-'A']}); ^ user.cpp: In function ‘void rez()’: user.cpp:96:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int lim = 2; lim < word.size(); ++lim ) ^ user.cpp:97:36: 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:123:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < word.size(); ++i ) pos[word[i]-'A'] = i; ^