Leetcode
2020.04.25 06:41

# 443. String Compression

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Given an array of characters, compress it in-place.

The length after compression must always be smaller than or equal to the original array.

Every element of the array should be a character (not int) of length 1.

After you are done modifying the input array in-place, return the new length of the array.

Could you solve it using only O(1) extra space?

Example 1:

```Input:
["a","a","b","b","c","c","c"]

Output:
Return 6, and the first 6 characters of the input array should be: ["a","2","b","2","c","3"]

Explanation:
"aa" is replaced by "a2". "bb" is replaced by "b2". "ccc" is replaced by "c3".
```

Example 2:

```Input:
["a"]

Output:
Return 1, and the first 1 characters of the input array should be: ["a"]

Explanation:
Nothing is replaced.
```

Example 3:

```Input:
["a","b","b","b","b","b","b","b","b","b","b","b","b"]

Output:
Return 4, and the first 4 characters of the input array should be: ["a","b","1","2"].

Explanation:
Since the character "a" does not repeat, it is not compressed. "bbbbbbbbbbbb" is replaced by "b12".
Notice each digit has it's own entry in the array.
```

Note:

1. All characters have an ASCII value in `[35, 126]`.
2. `1 <= len(chars) <= 1000`.

```class Solution {
public int compress(char[] chars) {
List<Character> list = new ArrayList<>();
char curr = chars[0];
int count = 1;

for(int i=0; i<chars.length; i++){
int next = i + 1;
if(next < chars.length && chars[i] == chars[next]){
count++;
}else{
curr = chars[next<chars.length?next:i];
if(count > 1){
for(int j=0; j<(count+"").length(); j++){
}
}
count = 1;
}
}

for(int i=0; i<list.size(); i++){
//System.out.println(list.get(i));
chars[i] = list.get(i);
}

return list.size();
}
}```

```class Solution {
public int compress(char[] chars) {
List<Character> list = new ArrayList<>();
int curr = 0;
int count = 1;

for(int i=0; i<chars.length; i++){
int next = i + 1;
if(next < chars.length && chars[i] == chars[next]){
count++;
}else{
curr = next < chars.length ? next : i;
if(count > 1){
for(int j=0; j<(count+"").length(); j++){
}
}
count = 1;
}
}

for(int i=0; i<list.size(); i++){
//System.out.println(list.get(i));
chars[i] = list.get(i);
}

return list.size();
}
}```

```class Solution {
public int compress(char[] chars) {
int index = 0;
int buffer = 0;

for (int i = 0; i < chars.length; i++) {
int next = i + 1;
if (next == chars.length || chars[i] != chars[next]) {
chars[buffer++] = chars[index];
if (index < i) {
String count = (i - index + 1) + "";
for(int j=0; j<count.length(); j++){
chars[buffer++] = count.charAt(j);
}
}
index = next;
}
}
return buffer;
}
}```

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