Compilare: user.cpp: In function ‘int main()’: user.cpp:31:23: warning: too many arguments for format [-Wformat-extra-args] scanf("%d", &n, &m); ^ user.cpp:31:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n, &m); ^ user.cpp:34:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i][j].x); ^