cses

CSES Solutions (0x6A73)
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missing_number.cpp (280B)

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// 1083. Missing Number
#include <bits/stdc++.h>
using namespace std;

int main() {
  static int num, xum, x;
  scanf("%d", &num);
  for (int i = 1; i <= num; i++)
    xum ^= i;
  for (int i = 0; i < num - 1; i++) {
    scanf("%d", &x);
    xum ^= x;
  }
  printf("%d\n", xum);
}