暴力，朴实无华

解题思路:

注意事项:

参考代码:

#include<iostream>

using namespace std;

int n;

bool o;

int y = 0;

bool sf(int x, int w)

{

int a, b, c, d, e, f;

a = x % 10;

b = (x / 10) % 10;

c = (x / 100) % 10;

d = (x / 1000) % 10;

e = (x / 10000) % 10;

f = (x / 100000) % 10;

if (x > 99999 && (a == f) && (b == e) && (c == d))

{

if ((a + b + c + d + e + f) == w)

{

y = 6;

return true;

}

}

if (x <= 99999 && (a == e) && (b == d))

{

if ((a + b + c + e + d) == w)

{

y = 6;

return true;

}

}

return false;

}

int main()

{

cin >> n;

for (int i = 10000; i <= 999999; i++)

{

o = sf(i, n);

if (o == 1)

{

cout << i << endl;

}

}

if (y!=6)

cout << -1 << endl;

return 0;

}