QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#638692 | #5661. Multi-Ladders | wmw# | WA | 0ms | 3584kb | C++20 | 1.1kb | 2024-10-13 16:38:23 | 2024-10-13 16:38:23 |
Judging History
answer
#include <bits/stdc++.h>
#define int long long
#define endl '\n'
#define all(v) v.begin(), v.end()
#define prs(v) sort(all(v)); v.erase(unique(all(v)), v.end())
using namespace std;
constexpr int mod = 1'000'000'007;
auto modpow(int base, int exp) {
int res = 1;
while (exp) {
if (exp & 1) res = res * base % mod;
base = base * base % mod;
exp >>= 1;
}
return res;
}
auto sum_of_ratio(int a, int n, int r) {
return a * (modpow(r, n) - 1 + mod) % mod * modpow(r - 1, mod - 2) % mod;
}
signed main() {
cin.tie(0)->sync_with_stdio(0);
int t;
cin >> t;
while (t--) {
int n, k, l;
cin >> n >> k >> l;
int include = sum_of_ratio((k & 1) ? (l - 1) * (l - 1) % mod : (l - 1), k / 2, (l - 1) * (l - 1) % mod);
int exclude = sum_of_ratio((k & 1) ? (l - 1) : (l - 1) * (l - 1) % mod, (k - 1) / 2, (l - 1) * (l - 1) % mod);
int sum = l * (include - exclude) % mod;
int res = sum * (modpow(modpow((l * l - 3 * l + 3) % mod, n - 1), k)) % mod;
cout << res << endl;
}
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3584kb
input:
1 2 3 3
output:
162
result:
ok single line: '162'
Test #2:
score: -100
Wrong Answer
time: 0ms
memory: 3560kb
input:
20 2 3 3 1 3 3 10 3 0 10 3 2 1 21 2 1 22 0 2000 15000 2000 12000 30000 200000 1000000000 3 3 2 1000000000 3 2 3 100000000 1000000000 1000000000 10 1000000000 3 100000000 2 1000000000 100000000 1 1000000000 10 1 1000000000 100000000 1 1000 100000000 1000000000 1000000000 0 1000000000 1000000000 1 100...
output:
162 6 0 0 0 0 -650599866 243010659 52489881 53690844 176686901 218103365 558243892 -8104796 693053429 -116284335 80402569 0 0 -688247194
result:
wrong answer 7th lines differ - expected: '349400141', found: '-650599866'