結果
問題 | No.886 Direct |
ユーザー |
|
提出日時 | 2023-07-22 17:49:29 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 249 ms / 4,000 ms |
コード長 | 4,482 bytes |
コンパイル時間 | 1,692 ms |
コンパイル使用メモリ | 204,688 KB |
最終ジャッジ日時 | 2025-02-15 18:04:31 |
ジャッジサーバーID (参考情報) |
judge2 / judge1 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 4 |
other | AC * 32 |
ソースコード
#include<bits/stdc++.h>using namespace std;//#pragma GCC optimize("Ofast")#define rep(i,n) for(ll i=0;i<n;i++)#define repl(i,l,r) for(ll i=(l);i<(r);i++)#define per(i,n) for(ll i=(n)-1;i>=0;i--)#define perl(i,r,l) for(ll i=r-1;i>=l;i--)#define fi first#define se second#define pb push_back#define ins insert#define pqueue(x) priority_queue<x,vector<x>,greater<x>>#define all(x) (x).begin(),(x).end()#define CST(x) cout<<fixed<<setprecision(x)#define vtpl(x,y,z) vector<tuple<x,y,z>>#define rev(x) reverse(x);using ll=long long;using vl=vector<ll>;using vvl=vector<vector<ll>>;using pl=pair<ll,ll>;using vpl=vector<pl>;using vvpl=vector<vpl>;const ll MOD=1000000007;const ll MOD9=998244353;const int inf=1e9+10;const ll INF=4e18;const ll dy[9]={1,0,-1,0,1,1,-1,-1,0};const ll dx[9]={0,1,0,-1,1,-1,1,-1,0};template<class T> inline bool chmin(T& a, T b) {if (a >= b) {a = b;return true;}return false;}template<class T> inline bool chmax(T& a, T b) {if (a < b) {a = b;return true;}return false;}const int mod = MOD;const int max_n = 200005;struct mint {ll x; // typedef long long ll;mint(ll x=0):x((x%mod+mod)%mod){}mint operator-() const { return mint(-x);}mint& operator+=(const mint a) {if ((x += a.x) >= mod) x -= mod;return *this;}mint& operator-=(const mint a) {if ((x += mod-a.x) >= mod) x -= mod;return *this;}mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;}mint operator+(const mint a) const { return mint(*this) += a;}mint operator-(const mint a) const { return mint(*this) -= a;}mint operator*(const mint a) const { return mint(*this) *= a;}mint pow(ll t) const {if (!t) return 1;mint a = pow(t>>1);a *= a;if (t&1) a *= *this;return a;}bool operator==(const mint &p) const { return x == p.x; }bool operator!=(const mint &p) const { return x != p.x; }// for prime modmint inv() const { return pow(mod-2);}mint& operator/=(const mint a) { return *this *= a.inv();}mint operator/(const mint a) const { return mint(*this) /= a;}};istream& operator>>(istream& is, mint& a) { return is >> a.x;}ostream& operator<<(ostream& os, const mint& a) { return os << a.x;}using vm=vector<mint>;using vvm=vector<vm>;struct combination {vector<mint> fact, ifact;combination(int n):fact(n+1),ifact(n+1) {assert(n < mod);fact[0] = 1;for (int i = 1; i <= n; ++i) fact[i] = fact[i-1]*i;ifact[n] = fact[n].inv();for (int i = n; i >= 1; --i) ifact[i-1] = ifact[i]*i;}mint operator()(int n, int k) {if (k < 0 || k > n) return 0;return fact[n]*ifact[k]*ifact[n-k];}}comb(max_n);struct osak{vector<long long> lpf;// least prime factorvector<long long> prime;// prime tableosak(long long n){//linear_sievelpf=vector<long long>(n+1,-1);for (int d = 2; d <= n; ++d) {if(lpf[d]==-1){lpf[d]=d;prime.emplace_back(d);}for(auto p:prime){if(p*d>n||p>lpf[d])break;lpf[p*d]=p;}}}map<long long,long long> factor(int n) {map<long long,long long> factor;while (n > 1) {factor[lpf[n]]++;n /= lpf[n];}return factor;}vector<long long> divisor(int N){//O(div.size())map<long long,long long> facs=factor(N);vector<long long> ret={1};for(auto p:facs){ll range=ret.size();ll now=1;for(int i=0;i<p.se;i++){now*=p.fi;for(int j=0;j<range;j++){ret.emplace_back(ret[j]*now);}}}sort(ret.begin(),ret.end());return ret;}};int main(){ll h,w;cin >> h >> w;mint ans=0;/*for(ll i=1;i<h;i++){for(ll j=1;j<w;j++){if(gcd(i,j)!=1)continue;ans+=(h-i)*(w-j);}}*/ll M=max(h,w)+1;vm dp(M);osak os(M);for(ll i=1;i<M;i++){mint f=0,g=0;for(ll j=i;j<h;j+=i)f+=(h-j);for(ll j=i;j<w;j+=i)g+=(w-j);dp[i]=f*g;}//rep(i,M)cout << dp[i] <<" ";cout << endl;for(auto p:os.prime){for(ll k=1;k*p<M;k++)dp[k]-=dp[k*p];}//rep(i,M)cout << dp[i] <<" ";cout << endl;ans=dp[1]*2;cout << ans+h*(w-1)+w*(h-1) << endl;}