Compilare: user.cpp: In function ‘int main()’: user.cpp:60:22: warning: statement has no effect [-Wunused-value] a[x][y+1]==2; ^ user.cpp:68:24: warning: statement has no effect [-Wunused-value] a[x+1][y+1]==2; ^ user.cpp:85:22: warning: statement has no effect [-Wunused-value] a[x][y-1]==2; ^ user.cpp:93:24: warning: statement has no effect [-Wunused-value] a[x-1][y-1]==2; ^ user.cpp:6:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("betasah.in","r",stdin); ^ user.cpp:7:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("betasah.out","w",stdout); ^ user.cpp:8:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d\n",&n,&d,&k); ^ user.cpp:11:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&i1,&j1); ^ user.cpp:18:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&i1,&j1); ^