Time Exceeded
/in/foo.cc: In function 'int main()':
/in/foo.cc:15:5: warning: operation on 'n' may be undefined [-Wsequence-point]
a[--n]=(a[n]+a[n-1])/k;
^~~
/in/foo.cc:15:5: warning: operation on 'n' may be undefined [-Wsequence-point]
/in/foo.cc: In function 'int main()':
/in/foo.cc:15:5: warning: operation on 'n' may be undefined [-Wsequence-point]
a[--n]=(a[n]+a[n-1])/k;
^~~
/in/foo.cc:15:5: warning: operation on 'n' may be undefined [-Wsequence-point]