foo.cc: In function 'int main()':
foo.cc:23:29: warning: use of 'll' length modifier with 'f' type character has either no effect or undefined behavior [-Wformat=]
if(j>n) scanf("%llf",&b[i]);
^
foo.cc:24:29: warning: use of 'll' length modifier with 'f' type character has either no effect or undefined behavior [-Wformat=]
else scanf("%llf",&c[i][j]),a[i][j]=c[i][j];
^
foo.cc:19:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&n);
~~~~~^~~~~~~~~
foo.cc:23:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
if(j>n) scanf("%llf",&b[i]);
~~~~~^~~~~~~~~~~~~~
foo.cc:24:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
else scanf("%llf",&c[i][j]),a[i][j]=c[i][j];
~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
foo.cc:29:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
for (int i=1;i<=n;i++) scanf("0 ");
~~~~~^~~~~~