比赛 |
2022级数学专题练习赛5 |
评测结果 |
AAWWWAAAAA |
题目名称 |
Pell方程 |
最终得分 |
70 |
用户昵称 |
op_组撒头屯 |
运行时间 |
0.000 s |
代码语言 |
C++ |
内存使用 |
0.00 MiB |
提交时间 |
2023-01-09 20:49:35 |
显示代码纯文本
- #include <bits/stdc++.h>
- using namespace std;
- #define ll long long
- #define ull unsigned long long
- #define ld long double
- #define pii pair<int,int>
- #define vi vector<int>
- #define si set<int>
- #define qi queue<int>
- #define sti stack<int>
- #define fi first
- #define se second
- #define pb push_back
- const int N=10000000+5;
- ll calc(ll x,ll lim){
- ll l=1,r=lim;
- while(l<r){
- ll mid=(l+r+1)/2;
- if (mid*mid<=x)l=mid;
- else r=mid-1;
- }
- return l;
- }
- int main(){
- freopen ("pell.in","r",stdin);
- freopen ("pell.out","w",stdout);
- ll n;scanf("%lld",&n);
- for (ll k=1;;k++){
- ll y=n*k*k-2*k;
- ll s=calc(y,k*n-1);
- if (s*s==y){
- printf("%lld %lld\n",k*n-1,s);return 0;
- }
- y=n*k*k+2*k;
- s=calc(y,k*n+1);
- if (s*s==y){
- printf("%lld %lld\n",k*n+1,s);return 0;
- }
- }
- printf("genshin\n");
- return 0;
- }
-