Compilare: user.cpp: In function ‘int main()’: user.cpp:33:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!dqs[a].empty()) tlen = dqs[a].front().len + 1; ^ user.cpp:33:41: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!dqs[a].empty()) tlen = dqs[a].front().len + 1; ^ user.cpp:36:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!dqs[b].empty() && dqs[b].back().len<=tlen) ^ user.cpp:36:39: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!dqs[b].empty() && dqs[b].back().len<=tlen) ^ user.cpp:37:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] dqs[b].pop_back(); ^ user.cpp:38:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] dqs[b].push_back({tlen, i}); ^ user.cpp:19:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d",&n,&k); ^ user.cpp:21:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%s",str); ^