結果
| 問題 |
No.1287 えぬけー
|
| コンテスト | |
| ユーザー |
rniya
|
| 提出日時 | 2020-11-13 22:15:34 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 3,405 bytes |
| コンパイル時間 | 2,283 ms |
| コンパイル使用メモリ | 200,456 KB |
| 最終ジャッジ日時 | 2025-01-15 23:21:41 |
|
ジャッジサーバーID (参考情報) |
judge3 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | WA * 1 TLE * 4 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
#define LOCAL
#pragma region Macros
typedef long long ll;
#define ALL(x) (x).begin(),(x).end()
const long long MOD=1000000007;
// const long long MOD=998244353;
const int INF=1e9;
const long long IINF=1e18;
const int dx[4]={1,0,-1,0},dy[4]={0,1,0,-1};
const char dir[4]={'D','R','U','L'};
template<typename T>
istream &operator>>(istream &is,vector<T> &v){
for (T &x:v) is >> x;
return is;
}
template<typename T>
ostream &operator<<(ostream &os,const vector<T> &v){
for (int i=0;i<v.size();++i){
os << v[i] << (i+1==v.size()?"": " ");
}
return os;
}
template<typename T,typename U>
ostream &operator<<(ostream &os,const pair<T,U> &p){
os << '(' << p.first << ',' << p.second << ')';
return os;
}
template<typename T,typename U>
ostream &operator<<(ostream &os,const map<T,U> &m){
os << '{';
for (auto itr=m.begin();itr!=m.end();++itr){
os << '(' << itr->first << ',' << itr->second << ')';
if (++itr!=m.end()) os << ',';
--itr;
}
os << '}';
return os;
}
template<typename T>
ostream &operator<<(ostream &os,const set<T> &s){
os << '{';
for (auto itr=s.begin();itr!=s.end();++itr){
os << *itr;
if (++itr!=s.end()) os << ',';
--itr;
}
os << '}';
return os;
}
void debug_out(){cerr << '\n';}
template<class Head,class... Tail>
void debug_out(Head&& head,Tail&&... tail){
cerr << head;
if (sizeof...(Tail)>0) cerr << ", ";
debug_out(move(tail)...);
}
#ifdef LOCAL
#define debug(...) cerr << " ";\
cerr << #__VA_ARGS__ << " :[" << __LINE__ << ":" << __FUNCTION__ << "]" << '\n';\
cerr << " ";\
debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif
template<typename T> T gcd(T x,T y){return y!=0?gcd(y,x%y):x;}
template<typename T> T lcm(T x,T y){return x/gcd(x,y)*y;}
template<class T1,class T2> inline bool chmin(T1 &a,T2 b){
if (a>b){a=b; return true;} return false;
}
template<class T1,class T2> inline bool chmax(T1 &a,T2 b){
if (a<b){a=b; return true;} return false;
}
#pragma endregion
int64_t mod_log(int64_t a, int64_t b, int64_t p) {
int64_t g = 1;
for(int64_t i = p; i; i /= 2) (g *= a) %= p;
g = __gcd(g, p);
int64_t t = 1, c = 0;
for(; t % g; c++) {
if(t == b) return c;
(t *= a) %= p;
}
if(b % g) return -1;
t /= g;
b /= g;
int64_t n = p / g, h = 0, gs = 1;
for(; h * h < n; h++) (gs *= a) %= n;
unordered_map< int64_t, int64_t > bs;
for(int64_t s = 0, e = b; s < h; bs[e] = ++s) {
(e *= a) %= n;
}
for(int64_t s = 0, e = t; s < n;) {
(e *= gs) %= n;
s += h;
if(bs.count(e)) return c + s - bs[e];
}
return -1;
}
long long modpow(long long x,long long n,long long mod){
long long res=1;
while (n>0){
if (n&1LL) res=res*x%mod;
x=x*x%mod; n>>=1LL;
}
return res;
}
long long modinv(long long x,long long p){
return modpow(x,p-3,p);
}
constexpr int r=5;
int main(){
cin.tie(0);
ios::sync_with_stdio(false);
int T; cin >> T;
for (;T--;){
int X,K; cin >> X >> K;
if (X==0){
cout << 0 << '\n';
return 0;
}
ll x=mod_log(r,X,MOD),inv=modinv(K,MOD-1);
// debug(x,K,inv);
(x*=inv)%=(MOD-1);
ll ans=modpow(r,x,MOD);
cout << ans << '\n';
}
}
rniya