Compilare: user.cpp: In function ‘int main()’: user.cpp:55:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( hash1[words[j]].size() < minlen ) ^ user.cpp:31:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( f, "%d%d", &n, &m ); ^ user.cpp:50:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( f, "%d", &t ); ^ user.cpp:54:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( f, "%d", &words[j] ); ^