题目:给定一个数N。去掉末尾的数变成M。如今已知N-M,确定N。

分析:数论。简单题。

设N = 10*a + b { 当中0 ≤ b ≤ 9 }。则M = a;

N - M = N - a = 9*a + b,枚举全部的b计算出满足条件的N就可以。

说明:目标500题(⊙_⊙)。

#include <iostream>
#include <cstdlib>
#include <cmath> using namespace std; int main()
{
long long n,a;
while (cin >> n && n) {
int count = 0;
for (int b = 9 ; b >= 0 ; -- b)
if ((n-b)%9LL == 0LL) {
if (count ++) cout << " ";
cout << (n-b)/9LL*10+b+0LL;
}
cout << endl;
}
return 0;
}

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