Compilare: user.cpp: In function ‘void Build_suffix()’: user.cpp:28:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(i = 0; i < N; ++i) alpha[ s[i] ] = 1; ^ user.cpp:32:54: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(i = 1; i <= N; ++i) suff[i] = {alpha[ s[i-1] ], 0, i}; ^ user.cpp: In function ‘int main()’: user.cpp:74:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&N); ^ user.cpp:75:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%s",s); ^ user.cpp:79:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&M); ^ user.cpp:82:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&x,&y); ^