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class Solution { int sum = 0; int n = 0; int [] sumArr; public Solution(int[] w) { int i=0; n=w.length; sumArr = new int[n]; for(int a:w){ sum+=a; sumArr[i++]=sum; } } public int pickIndex() { int rdx = (int) (Math.random()*sum)+1; int left = 0; int right = n-1; while(left<right){ int mid = left+(right-left)/2; if(rdx == sumArr[mid]) return mid; else if(rdx>sumArr[mid]) left = mid+1; else right = mid; } return left; } } /** * Your Solution object will be instantiated and called as such: * Solution obj = new Solution(w); * int param_1 = obj.pickIndex(); */
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