Compilare: user.cpp: In function ‘int main()’: user.cpp:31:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j < s[i].size()) latest[s[i][j]] = j; ^ user.cpp:31:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(j < s[i].size()) latest[s[i][j]] = j; ^ user.cpp:50:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if(nxt[i][0][x] != s[i].size()) matches = true, st[i].push(nxt[i][0][x]); ^ user.cpp:50:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(nxt[i][0][x] != s[i].size()) matches = true, st[i].push(nxt[i][0][x]); ^ user.cpp:50:81: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if(nxt[i][0][x] != s[i].size()) matches = true, st[i].push(nxt[i][0][x]); ^ user.cpp:53:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(nxt[i][st[i].top()][x] != s[i].size()) matches = true; ^ user.cpp:53:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nxt[i][st[i].top()][x] != s[i].size()) matches = true; ^ user.cpp:54:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] st[i].push(nxt[i][st[i].top()][x]); ^