Compilare: user.cpp: In function ‘int main()’: user.cpp:14:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] alph[line[i]] = i; ^ user.cpp:20:47: warning: array subscript has type ‘char’ [-Wchar-subscripts] word[i] = word[i] * SIGMA + alph[line[j]]; ^ user.cpp:11:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d\n", &t, &n); ^ user.cpp:12:28: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(line, SIGMA+3, fin); ^ user.cpp:18:28: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(line, SIGMA, fin); ^