Compilare: user.cpp: In function ‘void Build_suffix()’: user.cpp:39:44: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(i = 1; i <= N; ++i) ++alfa[ s[i-1] ]; ^ user.cpp:43:55: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(i = 1; i <= N; ++i) suff[i][0] = alfa[ s[i-1] ], suff[i][1] = 0; ^ user.cpp:34:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,l,cnt=0; ^ user.cpp: In function ‘int main()’: user.cpp:82:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&T); ^ user.cpp:85:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d\n",&N,&K); ^ user.cpp:86:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%s",s); ^ user.cpp:114:37: warning: ‘id’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout,"%d %d\n",id,id+f-1); ^ user.cpp:114:37: warning: ‘f’ may be used uninitialized in this function [-Wmaybe-uninitialized]