443. 压缩字符串

笑了，返回字符串数组末尾加上’\0’会报

AddressSanitizer: heap-buffer-overflow on address

开两个数组，一个记录字符，一个记录个数，mark标记上一字符，若不同则更新mark

#define f(i, a, b) for (int i = a; i <= b; i++)

int compress(char* chars, int charsSize){
int a[2000]={0},b[2000]={0},ac=0; 
char mark='\0';
f(i,0,charsSize-1){
if(chars[i]!=mark){
    a[ac]=chars[i];
    b[ac++]=1;
    mark=chars[i];
}
else if(chars[i]==mark){
    b[ac-1]+=1;
}
}
int now=0;
f(j,0,ac-1){
    if(b[j]==1)
    chars[now++]=a[j];
    else {
        chars[now++]=a[j];
        char temp[10];
        sprintf(temp,"%d",b[j]);
        f(k,0,strlen(temp)-1)
        chars [now++]=temp[k];
    }
}
return now;
}