Wrong Answer
/in/foo.cc: In function 'int main()': /in/foo.cc:13:5: warning: operation on 'n' may be undefined [-Wsequence-point] a[--n]=(a[n]+a[n-1])/k; ^~~ /in/foo.cc:13:5: warning: operation on 'n' may be undefined [-Wsequence-point]
/in/foo.cc: In function 'int main()': /in/foo.cc:13:5: warning: operation on 'n' may be undefined [-Wsequence-point] a[--n]=(a[n]+a[n-1])/k; ^~~ /in/foo.cc:13:5: warning: operation on 'n' may be undefined [-Wsequence-point]