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- #include <iostream>
- #include <vector>
- #include <algorithm>
- using namespace std;
- int main() {
- vector<int> train(55, 1);
- int n;
- cin >> n;
- for (int i = 0; i < n; ++i) {
- int curr;
- cin >> curr;
- train[curr] = 0;
- }
- int j = 54;
- int maxx = 0;
- int i = 1;
- int currMax;
- while (i <= 33) {
- int sum = train[i++] + train[i++] + train[i++] + train[i++] + train[j--] + train[j--];
- if (!sum) {
- maxx = max(maxx, ++currMax);
- } else {
- currMax = 0;
- }
- }
- cout << maxx;
- return 0;
- }
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