Submission #2077653
Source Code Expand
#include <bits/stdc++.h> using namespace std; typedef long long nagai; const nagai mod = 1000000007; void md(nagai& x) { if (x >= mod) x -= mod; } int main() { int n; cin >> n; vector<nagai> cnt(n + 1); cnt[0] = 1; cnt[1] = n; nagai cursum = 0; for (int i = 2; i <= n; ++i) { md(cnt[i] += cnt[i - 1]); (cnt[i] += 1LL * (n - 2 + 1) * (n - 1)) %= mod; int cnt0 = (n - 2 + 1) - (i - 3 - 0 + 1); md(cnt[i] += cnt0); md(cnt[i] += cursum); md(cursum += cnt[i - 2]); //for (int k = 2; k <= n; ++k) //md(cnt[i] += cnt[max(0, i - k - 1)]); //cerr << cnt[i] << ' '; } //cerr << endl; cout << cnt.back() << endl; }
Submission Info
Submission Time | |
---|---|
Task | F - Infinite Sequence |
User | scanhex |
Language | C++14 (GCC 5.4.1) |
Score | 1000 |
Code Size | 680 Byte |
Status | AC |
Exec Time | 13 ms |
Memory | 8064 KB |
Judge Result
Set Name | Sample | All | ||||
---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 1000 / 1000 | ||||
Status |
|
|
Set Name | Test Cases |
---|---|
Sample | 0_000.txt, 0_001.txt |
All | 0_000.txt, 0_001.txt, max_1000000.txt, max_999745.txt, max_999880.txt, max_999999.txt, min_1.txt, rnd_14.txt, rnd_22.txt, rnd_25002.txt, rnd_2956.txt, rnd_3.txt, rnd_380467.txt, rnd_407774.txt, rnd_52228.txt, rnd_68.txt, rnd_804783.txt, rnd_85984.txt, rnd_894324.txt, rnd_93.txt, rnd_963981.txt, rnd_968416.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
0_000.txt | AC | 1 ms | 256 KB |
0_001.txt | AC | 9 ms | 5376 KB |
max_1000000.txt | AC | 13 ms | 8064 KB |
max_999745.txt | AC | 13 ms | 8064 KB |
max_999880.txt | AC | 13 ms | 8064 KB |
max_999999.txt | AC | 13 ms | 8064 KB |
min_1.txt | AC | 1 ms | 256 KB |
rnd_14.txt | AC | 1 ms | 256 KB |
rnd_22.txt | AC | 1 ms | 256 KB |
rnd_25002.txt | AC | 2 ms | 384 KB |
rnd_2956.txt | AC | 1 ms | 256 KB |
rnd_3.txt | AC | 1 ms | 256 KB |
rnd_380467.txt | AC | 6 ms | 3200 KB |
rnd_407774.txt | AC | 7 ms | 3456 KB |
rnd_52228.txt | AC | 2 ms | 640 KB |
rnd_68.txt | AC | 1 ms | 256 KB |
rnd_804783.txt | AC | 11 ms | 6528 KB |
rnd_85984.txt | AC | 2 ms | 896 KB |
rnd_894324.txt | AC | 12 ms | 7296 KB |
rnd_93.txt | AC | 1 ms | 256 KB |
rnd_963981.txt | AC | 13 ms | 7808 KB |
rnd_968416.txt | AC | 13 ms | 7808 KB |