Compilare: user.cpp: In function ‘void write()’: user.cpp:89:25: warning: unused variable ‘p’ [-Wunused-variable] int i, k = sqrt(n), p = k; ^ user.cpp: In function ‘void read()’: user.cpp:9:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp: In function ‘void write()’: user.cpp:101:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &y, &pos); ^