阅读程序（2）

7-12题  组合题

#include <algorithm>

#include <iostream>

using namespace std;


int n, a[1005];


struct Node

{

int h, j, m, w;


Node(const int _h, const int _j, const int _m, const int _w):

h(_h), j(_j), m(_m), w(_w)

{ }


Node operator+(const Node &o) const

{

return Node(

max(h, w + o.h),

max(max(j, o.j), m + o.h),

max(m + o.w, o.m),

w + o.w);

}

};


Node solve1(int h, int m)

{

if (h > m)

return Node(-1, -1, -1, -1);

if (h == m)

return Node(max(a[h], 0), max(a[h], 0), max(a[h], 0), a[h]);

int j = (h + m) >> 1;

return solve1(h, j) + solve1(j + 1, m);

}


int solve2(int h, int m)

{

if (h > m)

return -1;

if (h == m)

return max(a[h], 0);

int j = (h + m) >> 1;

int wh = 0, wm = 0;

int wht = 0, wmt = 0;

for (int i = j; i >= h; i--) {

wht += a[i];

wh = max(wh, wht);

}

for (int i = j + 1; i <= m; i++) {

wmt += a[i];

wm = max(wm, wmt);

}

return max(max(solve2(h, j), solve2(j + 1, m)), wh + wm);

}


int main()

{

cin >> n;

for (int i = 1; i <= n; i++) cin >> a[i];

cout << solve1(1, n).j << endl;

cout << solve2(1, n) << endl;

return 0;

}

假设输入的所有数的绝对值都不超过 1000，完成下面的判断题和单选题：

程序总是会正常执行并输出两行两个相等的数。（ ）