package shuzu; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import java.math.BigInteger; import java.util.ArrayList; public class Test { public static void main(String[] args) throws IOException { try{ FileWriter fw =new FileWriter("a.txt"); //随机数 for(int i=0;i<10000000;i++) { long x=(long)(Math.random()*1000000000)*(Math.random()>0.5?1:-1); String y=""+x; fw.write(y); fw.write("\r\n"); System.out.println(y); } fw.close();} catch(FileNotFoundException e){ e.printStackTrace(); } ArrayList<String> arrList = new ArrayList<>(); try { FileReader fr = new FileReader("a.txt"); BufferedReader bf = new BufferedReader(fr); String st; while ((st = bf.readLine()) != null) { arrList.add(st); } bf.close(); fr.close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } long a[] = new long[arrList.size()]; for (int i = 0; i <arrList.size(); i++) { //数组转移 String s=arrList.get(i); a[i] = (long) Double.parseDouble(s); } long max=a[0]; long sum=a[0]; for(int i=1;i<a.length;i++) { if(sum<0) sum=a[i]; else sum+=a[i]; if(sum>max) max=sum; } System.out.println(max); } }
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