結果

問題 No.802 だいたい等差数列
ユーザー snuke
提出日時 2019-03-17 22:37:16
言語 C++11
(gcc 13.3.0)
結果
AC  
実行時間 36 ms / 2,000 ms
コード長 3,882 bytes
コンパイル時間 1,276 ms
コンパイル使用メモリ 163,044 KB
実行使用メモリ 34,432 KB
最終ジャッジ日時 2024-07-08 00:46:02
合計ジャッジ時間 3,299 ms
ジャッジサーバーID
(参考情報)
judge4 / judge1
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 4
other AC * 30
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
#define fi first
#define se second
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define rrep(i,n) for(int i = 1; i <= (n); ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define rng(a) a.begin(),a.end()
#define rrng(a) a.rbegin(),a.rend()
#define maxs(x,y) (x = max(x,y))
#define mins(x,y) (x = min(x,y))
#define limit(x,l,r) max(l,min(x,r))
#define lims(x,l,r) (x = max(l,min(x,r)))
#define isin(x,l,r) ((l) <= (x) && (x) < (r))
#define pb push_back
#define sz(x) (int)(x).size()
#define pcnt __builtin_popcountll
#define uni(x) x.erase(unique(rng(x)),x.end())
#define snuke srand((unsigned)clock()+(unsigned)time(NULL));
#define show(x) cout<<#x<<" = "<<x<<endl;
#define PQ(T) priority_queue<T,v(T),greater<T> >
#define bn(x) ((1<<x)-1)
#define dup(x,y) (((x)+(y)-1)/(y))
#define newline puts("")
#define v(T) vector<T>
#define vv(T) v(v(T))
using namespace std;
typedef long long int ll;
typedef unsigned uint;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<P> vp;
inline int in() { int x; scanf("%d",&x); return x;}
template<typename T>inline istream& operator>>(istream&i,v(T)&v)
{rep(j,sz(v))i>>v[j];return i;}
template<typename T>string join(const v(T)&v)
{stringstream s;rep(i,sz(v))s<<' '<<v[i];return s.str().substr(1);}
template<typename T>inline ostream& operator<<(ostream&o,const v(T)&v)
{if(sz(v))o<<join(v);return o;}
template<typename T1,typename T2>inline istream& operator>>(istream&i,pair<T1,T2>&v)
{return i>>v.fi>>v.se;}
template<typename T1,typename T2>inline ostream& operator<<(ostream&o,const pair<T1,T2>&v)
{return o<<v.fi<<","<<v.se;}
template<typename T>inline ll suma(const v(T)& a) { ll res(0); for (auto&& x : a) res += x; return res;}
const double eps = 1e-10;
const ll LINF = 1001002003004005006ll;
const int INF = 1001001001;
#define dame { puts("0"); return 0;}
#define yn {puts("YES");}else{puts("NO");}
const int MX = 2000005;
// Mod int
const int mod = 1000000007;
struct mint {
ll x;
mint():x(0){}
mint(ll x):x((x%mod+mod)%mod){}
// mint(ll x):x(x){}
mint& fix() { x = (x%mod+mod)%mod; return *this;}
mint operator-() const { return mint(0) - *this;}
mint operator~() const { return mint(1) / *this;}
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){ (x*=a.ex(mod-2).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 operator/(const mint& a)const{ return mint(*this) /= a;}
mint ex(ll t) const {
if(!t) return 1;
mint res = ex(t/2);
res *= res;
return (t&1)?res*x:res;
}
bool operator<(const mint& a)const{ return x < a.x;}
bool operator==(const mint& a)const{ return x == a.x;}
};
mint ex(mint x, ll t) { return x.ex(t);}
istream& operator>>(istream&i,mint&a){i>>a.x;return i;}
ostream& operator<<(ostream&o,const mint&a){o<<a.x;return o;}
typedef vector<mint> vm;
struct comb {
vm f, g;
comb(){}
comb(int mx):f(mx+1),g(mx+1) {
f[0] = 1;
rrep(i,mx) f[i] = f[i-1]*i;
g[mx] = f[mx].ex(mod-2);
for(int i=mx;i>0;i--) g[i-1] = g[i]*i;
}
mint c(int a, int b) {
if (a < b) return 0;
return f[a]*g[b]*g[a-b];
}
} c(MX);
//
int main() {
ll n,m,l,r;
cin>>n>>m>>l>>r;
m--;
m -= (n-1)*l;
if (m < 0) dame;
r -= l;
mint ans = 0;
rep(i,n) {
ll s = m-(r+1)*i;
if (s < 0) break;
mint now = c.c(s+n,n)*c.c(n-1,i);
ans += i&1?-now:now;
}
cout<<ans<<endl;
return 0;
}
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