HDU 1003 Max Sum
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Max Sum
Problem Description
Given a sequence a[1],a[2],a[3]……a[n], your job is to calculate the max sum of a sub-sequence. For example, given (6,-1,5,4,-7), the max sum in this sequence is 6 + (-1) + 5 + 4 = 14.
Input
The first line of the input contains an integer T(1<=T<=20) which means the number of test cases. Then T lines follow, each line starts with a number N(1<=N<=100000), then N integers followed(all the integers are between -1000 and 1000).
Output
For each test case, you should output two lines. The first line is “Case #:”, # means the number of the test case. The second line contains three integers, the Max Sum in the sequence, the start position of the sub-sequence, the end position of the sub-sequence. If there are more than one result, output the first one. Output a blank line between two cases.
Sample Input
2
5 6 -1 5 4 -7
7 0 6 -1 1 -6 7 -5
Sample Output
Case 1:
14 1 4Case 2:
7 1 6
Author
Ignatius.L
Code
import java.util.Scanner;public class Main { public static void main(String[] args) { Scanner s = new Scanner(System.in); int t = s.nextInt(); for (int z = 0; z < t; z++) { int len = s.nextInt(); int i = 1; int temp = s.nextInt(); int pos1, pos2, x; pos1 = pos2 = x = 1; int maxSum, sum; maxSum = sum = temp; while (i < len) { temp = s.nextInt(); i++; if (sum + temp < temp) { x = i; sum = temp; } else { sum += temp; } if (sum > maxSum) { maxSum = sum; pos1 = x; pos2 = i; } } System.out.println("Case " + (z + 1) + ":"); if (z != t - 1) { System.out.println(maxSum + " " + pos1 + " " + pos2); System.out.println(); } else System.out.println(maxSum + " " + pos1 + " " + pos2); } }}
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