Compilare: user.cpp: In function ‘int main()’: user.cpp:61:21: warning: unused variable ‘l’ [-Wunused-variable] int nr = 0, s , l; ^ user.cpp:31:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d %d\n",&n,&m,&x,&y); ^ user.cpp:37:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%c ",&ch); ^ user.cpp:66:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d ",&s); ^