/in/foo.cc: In function 'int main()':
/in/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]);
                             ^
/in/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];
                             ^