Compilare: user.cpp: In function ‘void Solve_2()’: user.cpp:24:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,ok=1; ^ user.cpp:26:22: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,NMax,fin); ^ user.cpp: In function ‘int main()’: user.cpp:70:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&p); ^ user.cpp:71:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d\n",&N); ^