Compilare: user.cpp: In function ‘int fill(int, int)’: user.cpp:10:8: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] {if(a[x][y]<a[x+dx[q]][y+dy[q]] && x+dx[q]>0 && x+dx[q]<=n && y+dy[q]>0 && y+dy[q]<=n) ^ user.cpp: In function ‘int main()’: user.cpp:22:34: 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:23:36: 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:24:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:27:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {scanf("%d",&a[i][j]); ^