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- int stairs(int n)
- {
- vector<long> q(n + 1, 0);
- q[0] = 1;
- for (int i = 1; i <= n; ++i) {
- for (int j = n; j >= i; --j) {
- q[j] += q[j - i];
- }
- }
- return q[n];
- }
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