View Compilation Error

0_0_28766963_24377.cpp: In function 'int judge(int)':
0_0_28766963_24377.cpp:8:133: error: 'elsereturn' was not declared in this scope
 {int right,left,mid;left=1;right=l1-1;while(left<=right){mid=(left+right)/2;if(sum[mid]>x)right=mid-1;else if(sum[mid]<x)left=mid+1;elsereturn 1;}return 0;
                                                                                                                                     ^