Ranked mode just got 6 new challenges, 4 hard and 2 medium ones.
I think the most interesting one is the implementation of an LRU (least recently used) cache structure. There are also 3 challenges related to the reverse Polish notation, which is a must-know for software engineers.
Below is a mysterious function, can you solve it?
function singleNumber(nums) {
let ret = 0;
for (let index = 0; index < nums.length; index++) {
const element = nums[index];
ret = ret ^ element;
}
return ret;
}
let A = singleNumber([2,3,4,3,2,5,1,5]);
// A = ?
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