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QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#635083 | #9451. Expected Waiting Time | ucup-team4906# | WA | 969ms | 46452kb | C++20 | 1.8kb | 2024-10-12 18:59:09 | 2024-10-12 18:59:10 |
Judging History
answer
#include <bits/stdc++.h>
typedef long long ll;
typedef unsigned long long ull;
using namespace std;
#define N 2000010
int fac[N], inv[N];
int a[N], b[N];
int f[N], g[N];
int n, P, A, B;
int C(int n, int m) {return 1LL * fac[n] * inv[m] % P * inv[n - m] % P;}
int qpow(int a, int b)
{
int ans = 1;
while (b) {if (b & 1) ans = 1LL * ans * a % P; b >>= 1; a = 1LL * a * a % P;}
return ans;
}
void sol()
{
cin >> n >> P >> b[0] >> A >> B;
for (int i = 1; i <= 2 * n; i ++)
{
b[i] = (1LL * A * b[i - 1] + B) % P;
a[i] = (a[i - 1] + b[i] + 1) % P;
}
fac[0] = 1;
for (int i = 1; i <= 2 * n; i ++) fac[i] = 1LL * fac[i - 1] * i % P;
inv[0] = inv[1] = 1;
for (int i = 2; i <= 2 * n; i ++) inv[i] = 1LL * (P - P / i) * inv[P % i] % P;
for (int i = 2; i <= 2 * n; i ++) inv[i] = 1LL * inv[i] * inv[i - 1] % P;
f[0] = 1;
for (int i = 1; i <= n; i ++)f[i] = (C(2 * i, i) + P - C(2 * i, i - 1)) % P;
for (int i = 0; i <= n - 1; i ++)g[i] = 1LL * f[i] * f[(2 * n - 2 - i * 2) / 2] % P;
for (int i = 0; i <= n - 1; i ++)g[i] = (g[i] + (i ? g[i - 1] : 0)) % P;
int ans = 0;
// cout << "??:" << g[0] << endl;
// for (int i = 1; i <= 2 * n; i ++) cout << a[i] << ' '; cout << endl;
for (int i = 1; i <= 2 * n; i ++)
{
int t = (2 * n - i - 1) / 2;
// cout << "EEE:" << i << ' ' << (2 * n - i - 1) / 2 << ' ' << (i - 2) / 2 << '\n';
if (i < 2 * n)ans = (ans + 1LL * (P - a[i]) * g[t]) % P;
t = (i - 2) / 2;
if (i > 1)ans = (ans + 1LL * a[i] * g[t]) % P;
}
ans = 1LL * ans * qpow(f[n], P - 2) % P;
cout << ans << '\n';
}
int main()
{
ios::sync_with_stdio(0);
cin.tie(0);
int T = 1;
cin >> T;
while (T --) sol();
return 0;
}
詳細信息
Test #1:
score: 100
Accepted
time: 2ms
memory: 11856kb
input:
5 1 1000000007 0 1 0 2 1000000007 0 1 1 2 7 5 2 3 3 31 15 6 24 20 1000000007 0 1 0
output:
1 12 1 21 879705565
result:
ok 5 number(s): "1 12 1 21 879705565"
Test #2:
score: 0
Accepted
time: 944ms
memory: 11848kb
input:
4400 3954 1000000007 0 1 0 1306 1000000007 0 1 0 3774 1000000007 0 1 0 3345 1000000007 0 1 0 891 1000000007 0 1 0 2462 1000000007 0 1 0 237 1000000007 0 1 0 26 1000000007 0 1 0 2510 1000000007 0 1 0 637 1000000007 0 1 0 3250 1000000007 0 1 0 3447 1000000007 0 1 0 1222 1000000007 0 1 0 133 1000000007...
output:
440618338 378292891 979368645 915766295 343598158 80867595 161627927 517387931 396936703 42785642 945720545 764273281 186237656 635777911 164064906 548455037 991964184 468137124 561243246 118562285 856945294 642467240 23673926 808943705 897417615 462422554 656411244 204288121 997894281 244685651 762...
result:
ok 4400 numbers
Test #3:
score: -100
Wrong Answer
time: 969ms
memory: 46452kb
input:
1019 338 1863833207 1820742817 1507924477 1822273457 770 1386304741 1088481071 1216187083 170973217 597 1604266739 620750027 196415899 456280997 105 1008587891 184044403 24836083 926135599 357 1165127407 440925347 1103369747 912263123 82 1639766993 263045351 631010551 1412721139 928 1715915153 25383...
output:
-134720567 -1111658827 -1031393775 827110887 695899770 -121846738 974461005 -631972015 1293431776 134216351 129116879 793070751 -1054442673 -1423648804 -276835620 1796124457 -945823859 548709853 -809303888 221202583 953274186 -1365376588 -874561356 539622309 558752169 1050819260 -341951483 844160548...
result:
wrong answer 1st numbers differ - expected: '1532578211', found: '-134720567'