#include <iostream>
using namespace std;
void solve()
{
int n; //碗数量
cin >> n;
int* container = new int[n + 1]; //存储米饭粒数的容器
for (int i = 0; i < n + 1; i++)
container[i] = i; //对容器赋值,第n个碗装了n粒米
//将输入数据排除(置0)
int temp;
for (int i = 0; i < n - 1; i++)
{
cin >> temp;
container[temp] = 0;
}
//遍历容器,不为0的就是拿走的碗里的米饭数量
for (int i = 1; i < n; i++)
if (container[i] != 0)
cout << container[i];
}
int main()
{
solve();
}
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