Compilare: user.cpp: In function ‘void backward(int, int)’: user.cpp:65:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.out", "w", stdout); ^ user.cpp: In function ‘int main()’: user.cpp:83:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.in", "r", stdin); ^ user.cpp:84:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:93:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&h[i][j]); ^ user.cpp:117:21: warning: ‘jd’ may be used uninitialized in this function [-Wmaybe-uninitialized] backward(id, jd); ^ user.cpp:117:21: warning: ‘id’ may be used uninitialized in this function [-Wmaybe-uninitialized]