S002-AC.cc
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#include <iostream>
using namespace std;
int getMissing(int* array)
{
int i = 0;
while(1)
{
if(!array[i++])
{
return i;
}
}
}
int main()
{
int n, m, o;
while(cin >> n)
{
int* array = new int[n];
m = 0;
for(int i = 0; i < n; i++)
{
array[i]=0;
}
while((++m) != n)
{
cin >> o;
array[o-1] = o;
}
cout << getMissing(array) << endl;
delete[] array;
}
return 0;
}