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 |
---|---|---|---|---|---|---|---|---|---|
#213781 | #2157. 数列 | N | 100 | 600ms | 1252kb | C++ | 1.3kb | 2024-11-13 19:29:28 | 2024-11-13 23:02:05 |
answer
//
// na 2157.cpp
// Competitive Programming
//
// Created by m2 on 2024/11/13.
//
#include <stdio.h>
#include <iostream>
using namespace std;
typedef long long int ll;
int n, mod;
inline int fac(int x){
int res = 1;
for(int i = 2; i <= x; ++i)
res = ll(res) * i % mod;
return res;
}
inline int qpow(int base, int exp){
int res = 1;
while(exp){
if(exp & 1)
res = ll(res) * base % mod;
base = ll(base) * base % mod;
exp >>= 1;
}
return res;
}
inline int inv(int x){
return qpow(x, mod - 2);
}
inline int mul(int a, int b){
return ll(a) * b % mod;
}
inline int C(int n, int k){
return mul(mul(fac(n), inv(fac(k))), inv(fac(n - k)));
}
//int dp[55][55];
int main(){
cin.tie(0)->sync_with_stdio(false);
cin >> n >> mod;
cout << mul(C(n * 2, n), inv(n + 1)) << endl;
// n = 10;
// dp[1][1] = 1;
// for(int i = 2; i <= n; ++i)
// for(int j = 1; j <= i * 2 - 3; ++j)
// for(int k = j + 1; k <= i * 2 - 1; ++k)
// dp[i][k] += dp[i - 1][j];
// for(n = 1; n <= 10; ++n){
// int ans = 0;
// for(int i = n; i <= n * 2 - 1; ++i)
// ans += dp[n][i];
// cout << ans << endl;
// }
return 0;
}
详细
小提示:点击横条可展开更详细的信息
Test #1:
score: 5
Accepted
time: 0ms
memory: 1252kb
input:
921 998054347
output:
345389219
result:
ok single line: '345389219'
Test #2:
score: 5
Accepted
time: 0ms
memory: 1252kb
input:
926 998064329
output:
458756691
result:
ok single line: '458756691'
Test #3:
score: 5
Accepted
time: 0ms
memory: 1252kb
input:
1000 998074327
output:
457273797
result:
ok single line: '457273797'
Test #4:
score: 5
Accepted
time: 0ms
memory: 1252kb
input:
952 998084303
output:
329700115
result:
ok single line: '329700115'
Test #5:
score: 5
Accepted
time: 1ms
memory: 1252kb
input:
989 998094347
output:
94788253
result:
ok single line: '94788253'
Test #6:
score: 5
Accepted
time: 0ms
memory: 1252kb
input:
902 998104313
output:
911969455
result:
ok single line: '911969455'
Test #7:
score: 5
Accepted
time: 0ms
memory: 1248kb
input:
914 998114333
output:
827812986
result:
ok single line: '827812986'
Test #8:
score: 5
Accepted
time: 0ms
memory: 1248kb
input:
986 998124313
output:
169699253
result:
ok single line: '169699253'
Test #9:
score: 5
Accepted
time: 0ms
memory: 1248kb
input:
947 998134339
output:
761932751
result:
ok single line: '761932751'
Test #10:
score: 5
Accepted
time: 0ms
memory: 1248kb
input:
934 998144339
output:
42889072
result:
ok single line: '42889072'
Test #11:
score: 5
Accepted
time: 61ms
memory: 1248kb
input:
991572 998154343
output:
277089318
result:
ok single line: '277089318'
Test #12:
score: 5
Accepted
time: 61ms
memory: 1248kb
input:
932800 998164337
output:
945072504
result:
ok single line: '945072504'
Test #13:
score: 5
Accepted
time: 55ms
memory: 1252kb
input:
903603 998174341
output:
29916736
result:
ok single line: '29916736'
Test #14:
score: 5
Accepted
time: 59ms
memory: 1252kb
input:
958646 998184331
output:
802903490
result:
ok single line: '802903490'
Test #15:
score: 5
Accepted
time: 60ms
memory: 1252kb
input:
983016 998194349
output:
802900579
result:
ok single line: '802900579'
Test #16:
score: 5
Accepted
time: 60ms
memory: 1252kb
input:
922347 998204353
output:
228575331
result:
ok single line: '228575331'
Test #17:
score: 5
Accepted
time: 64ms
memory: 1252kb
input:
976053 998214317
output:
982618317
result:
ok single line: '982618317'
Test #18:
score: 5
Accepted
time: 63ms
memory: 1252kb
input:
957300 998224351
output:
514549818
result:
ok single line: '514549818'
Test #19:
score: 5
Accepted
time: 60ms
memory: 1248kb
input:
921760 998234353
output:
470386410
result:
ok single line: '470386410'
Test #20:
score: 5
Accepted
time: 56ms
memory: 1252kb
input:
912948 998244353
output:
129235345
result:
ok single line: '129235345'