Looking for Coder


http://blog.csdn.net/zengzhen_csdn/article/details/52346930
请设计一个高效算法,再给定的字符串数组中,找到包含”Coder”的字符串(不区分大小写),并将其作为一个新的数组返回。结果字符串的顺序按照”Coder”出现的次数递减排列,若两个串中”Coder”出现的次数相同,则保持他们在原数组中的位置关系。
给定一个字符串数组A和它的大小n,请返回结果数组。保证原数组大小小于等于300,其中每个串的长度小于等于200。同时保证一定存在包含coder的字符串。
测试样例: 
[“i am a coder”,”Coder Coder”,”Code”] 

返回: 
[“Coder Coder”,”i am a coder”]
class Recorder{ private String data; //字符串 private int index; //在原数组中的位置 private int count; //含有多少个coder-1 public Recorder(String data, int index, int count){ this.data = data; this.index = index; this.count = count; } public String getData(){return data;} public int getIndex(){return index;} public int getCount(){return count;} } public class Coder { //统计"coder"出现的次数 static int count(String a, String b){ int count=0; int fromIndex=0; while(fromIndex!=-1){ fromIndex=a.indexOf(b,fromIndex); if(fromIndex!=-1){ fromIndex+=b.length(); count++; } } return count; } public String[] findCoder(String[] A, int n){ ArrayList<Recorder> result = new ArrayList<Recorder>(); for(int i=0;i<n;i++){ String a = A[i].toLowerCase(); //转小写 if(a.contains("coder")){ int count = 0; //遍历a查找"coder" count = count(a, "coder"); result.add(new Recorder(a, i, count)); } } //使用Collections提供的对List的归并排序 //需实现其Comparator接口参数 Collections.sort(result, new Comparator<Recorder>() { public int compare(Recorder o1, Recorder o2){ //先比"coder"个数, count大者排前面 if(o1.getCount() != o2.getCount()) return o2.getCount() - o1.getCount(); //再比index, index小者排前面 else return o1.getIndex() - o2.getIndex(); } }); String sorted[] = new String[result.size()]; for(int i=0;i<result.size();i++){ String s = result.get(i).getData(); sorted[i] = s; } return sorted; } }
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