Compilare: main.cpp: In function 'void add_hash(long int, long int)': main.cpp:29:8: warning: unused variable 'pfrac' [-Wunused-variable] double pfrac; ^~~~~ main.cpp: In function 'void get_hash(long int, long int)': main.cpp:55:8: warning: unused variable 'pfrac' [-Wunused-variable] double pfrac; ^~~~~ main.cpp: In function 'void citire()': main.cpp:157:14: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s,40,f); ^ main.cpp:201:19: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s,20,f); ^ main.cpp:231:19: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s,20,f); ^ main.cpp: In function 'void citire2()': main.cpp:275:42: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld %ld %ld %ld\n",&n,&m,&w,&h); ^ main.cpp:281:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld %ld\n",&x[k],&y[k]); ^ main.cpp:291:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld %ld\n",&ox,&oy); ^