Compilare: user.cpp: In function ‘int main()’: user.cpp:17:88: warning: operation on ‘b[i][j]’ may be undefined [-Wsequence-point] for(i=1;i<=n;i++) for(j=1;j<=n;j++) fscanf(f,"%d",&a[i][j]),b[i][j]=b[i][j]=a[i][j]; ^ user.cpp:16:64: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d %d %d %d %d",&n,&k1,&k2,&l1,&c1,&l2,&c2); ^ user.cpp:17:88: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=1;i<=n;i++) for(j=1;j<=n;j++) fscanf(f,"%d",&a[i][j]),b[i][j]=b[i][j]=a[i][j]; ^