Compilare: user.cpp: In function ‘int main()’: user.cpp:25:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alge.in", "r", stdin); ^ user.cpp:26:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alge.out", "w", stdout); ^ user.cpp:28:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:32:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &yy, &z); ^ user.cpp:91:18: warning: ‘new_z’ may be used uninitialized in this function [-Wmaybe-uninitialized] z = new_z; ^ user.cpp:90:19: warning: ‘new_y’ may be used uninitialized in this function [-Wmaybe-uninitialized] yy = new_y; ^ user.cpp:89:18: warning: ‘new_x’ may be used uninitialized in this function [-Wmaybe-uninitialized] x = new_x; ^