Compilare: user.cpp: In function ‘int main()’: user.cpp:23:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d%d%d", &x, &y, &n, &l); ^ user.cpp:26:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &d); ^ user.cpp:45:15: warning: ‘sy’ may be used uninitialized in this function [-Wmaybe-uninitialized] fill(sx, sy); ^ user.cpp:45:15: warning: ‘sx’ may be used uninitialized in this function [-Wmaybe-uninitialized]