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23 lines
529 B
C++

#define _CRT_SECURE_NO_WARNINGS
#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
#include <bits/stdc++.h>
using namespace std;
int main() {
int x;
scanf("%d", &x);
vector<int> v;
while (~scanf("%d", &x))
v.push_back(x);
sort(v.begin(), v.end());
for (int i = 1; i < v.size(); i++)
if (v[i - 1] == v[i] - 2)
printf("%d ", v[i] - 1);
for (int i = 1; i < v.size(); i++)
if (v[i - 1] == v[i])
printf("%d", v[i]);
return 0;
}