Compilare: main.cpp: In function 'int main()': main.cpp:53:23: warning: variable 'ch' set but not used [-Wunused-but-set-variable] int p , i , sol , ch ,cv; ^~ main.cpp:55:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d\n",&p); ^ main.cpp:56:26: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets (s , 400 , fin); ^