Compilare: main.cpp: In function 'int main()': main.cpp:42:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<hsh[nr].size();j++){ ~^~~~~~~~~~~~~~~ main.cpp:12:42: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d%d\n",&n,&m,&l,&k); ^ main.cpp:13:24: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets (s+1,n+1,fin); ^ main.cpp:32:28: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets (q+1,l+1,fin); ^