🌵830. Positions of Large Groups
https://leetcode.com/problems/positions-of-large-groups/
js
/**
* @param {string} S
* @return {number[][]}
*/
var largeGroupPositions = function(S) {
let pos = []
let current = ''
let length = 0
let start = 0
S.split('').forEach((l, i) => {
if (l === current) {
length++
} else {
if (length >= 3) {
pos.push([start, i - 1])
}
current = l
length = 1
start = i
}
})
if (length >= 3) {
pos.push([start, S.length - 1])
}
return pos
}py
class Solution:
def largeGroupPositions(self, S):
"""
:type S: str
:rtype: List[List[int]]
"""
pos = []
current = ''
length = 0
start = 0
for i, l in enumerate(S):
if l == current:
length += 1
else:
if length >= 3:
pos.append([start, i - 1])
current = l
length = 1
start = i
if length >= 3:
pos.append([start, i])
return pos