Compilare: user.cpp: In function ‘int main()’: user.cpp:33:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[str2[i]]++; ^ user.cpp:34:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(fr[str2[i]] == 1) { ^ user.cpp:42:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr1[str1[i]]++; ^ user.cpp:43:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(fr1[str1[i]] == fr[str1[i]]) { ^ user.cpp:43:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(fr1[str1[i]] == fr[str1[i]]) { ^ user.cpp:47:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(cur == let.size()) { ~~~~^~~~~~~~~~~~~ user.cpp:61:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] sp[i][str1[i]]++; ^ user.cpp:87:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr1[str1[deq.front()]]--; ^ user.cpp:93:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < sol.size(); i++) { ~~^~~~~~~~~~~~ user.cpp:27:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&type); ^ user.cpp:28:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%s %s " ,str1 + 1,str2 + 1); ^