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leetcode830.java

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package leetcode;

import java.util.ArrayList;

import java.util.List;

public class leetcode830 {

List<List<Integer>> list=new ArrayList<>();

public List<List<Integer>> largeGroupPositions(String S) {

char [] chars=S.toCharArray();

char cur=chars[0];

int start=0;

int end=0;

int num=1;

for (int i = 1; i <chars.length ; i++) {

if (chars[i]==cur){

end++;

num++;

}else {

if (num>=3){

List<Integer> temp=new ArrayList<>();

temp.add(start);

temp.add(end);

list.add(temp);

}

cur=chars[i]; //改变此时的字符值

end++;

start=end;

num=1;

}

}

if (num>=3){

List<Integer> temp=new ArrayList<>();

temp.add(start);

temp.add(end);

list.add(temp);

}

return list;

}

public static void main(String[] args) {

new leetcode830().largeGroupPositions("aaa");

}

}