HDU 1003 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 4 Case 2: 7 1 6

 

和最大的最长子序列：

#include<stdio.h>

int main ()

{

    int T, i, n, x, a, b, c, sum, M, k = 0, flag = 0;

    scanf("%d", &T);

    while (T--)

    {

        k++;

        scanf("%d %d", &n, &x);

        sum = M = x;

        a = b = c = 1;

        for (i = 2; i <= n; i++)

        {

            scanf("%d", &x);

            if (sum + x < x)

            {

                sum = x;

                a = i;

            } //若sum+x比x小，则将sum置为x，暂将此时的位置记录下来

            else

                sum += x; //否则直接加上

            if (sum > M)

            {

                M = sum;

                b = a;

                c = i;

            } //当找到更大子序列的和时更改最大值和对应位置

        }

        if (flag == 1)

            printf("\n");

        printf("Case %d:\n", k);

        printf("%d %d %d\n", M, b, c);

        flag = 1;

    }

    return 0;

}