[Algorithm] 31 week(8.29 ~ 9.04) 3/3

724. Find Pivot Index

var pivotIndex = function(nums) {
    let right = nums.reduce((acc, curr) => acc + curr, 0);
    let left = 0;
    
    for(let i = 0; i < nums.length; i++){
        right -= nums[i];
        if(left === right) return i;
        left += nums[i];
    }
    
    return -1;
}