Preview:
class Solution {
public:
    int jump(vector<int>& nums) {
        int n=nums.size();
        int cr=0, cmx=0, j=0;
        for(int i=0;i<n-1;i++)
        {
            if(i+nums[i]>cmx) cmx=i+nums[i];
            
            if(i==cr)
            {
                j++;
                cr=cmx;
            }
        }
        return j;
    }
};
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