25 lines
472 B
C++
25 lines
472 B
C++
#include <bits/stdc++.h>
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using namespace std;
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int main() {
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int n;
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cin >> n;
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vector<int> vec;
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for (int i = 0; i < n; i++) {
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int c;
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cin >> c;
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vec.push_back(c);
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}
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int count = 0;
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for (int i = 0; i < n - 1; i++) {
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for (int j = i + 1; j < n; j++) {
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if (abs(vec[i] - vec[j]) == 1) {
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count++;
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}
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}
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}
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cout << count << endl;
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return 0;
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}
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