Compilare: user.cpp: In function ‘int main()’: user.cpp:6:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("magic2.in","r",stdin); ^ user.cpp:7:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("magic2.out","w",stdout); ^ user.cpp:12:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:14:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(j=1;j<=n;++j) scanf("%d",&mat[i][j]); ^ user.cpp:50:16: warning: array subscript is above array bounds [-Warray-bounds] l1=l[1]; l2=l[2]; c1=c[1]; c2=c[2]; ^ user.cpp:50:34: warning: array subscript is above array bounds [-Warray-bounds] l1=l[1]; l2=l[2]; c1=c[1]; c2=c[2]; ^ user.cpp:66:16: warning: array subscript is above array bounds [-Warray-bounds] l1=l[1]; l2=l[2]; c1=c2=c[1]; ^ user.cpp:74:28: warning: array subscript is above array bounds [-Warray-bounds] l1=l2=l[1]; c1=c[1]; c2=c[2]; ^