CSP-201409-1-相邻数对

解题代码

#include <iostream>
#include <vector>
using namespace std;

vector<int>arr;
int num;

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);

	int n;
	cin >> n;

	for (int i = 0; i < n; i++)
	{
		int t;
		cin >> t;
		for (const auto& it : arr)
		{
			if (abs(t - it) == 1)
			{
				num++;
			}
		}
		arr.push_back(t);
	}

	cout << num;
    return 0;
}