結果
| 問題 |
No.801 エレベーター
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2019-03-17 21:29:47 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 67 ms / 2,000 ms |
| コード長 | 2,912 bytes |
| コンパイル時間 | 1,790 ms |
| コンパイル使用メモリ | 173,784 KB |
| 実行使用メモリ | 6,944 KB |
| 最終ジャッジ日時 | 2024-07-07 20:36:57 |
| 合計ジャッジ時間 | 4,171 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 26 |
ソースコード
#define _USE_MATH_DEFINES
#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define MT make_tuple
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
#define RT return
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;
using vll = vector<ll>;
template<int MOD>
class ModInt {
public:
ModInt() :value(0) {}
ModInt(long long val) :value((int)(val<0 ? MOD + val%MOD : val%MOD)) { }
ModInt& operator+=(ModInt that) {
value = value + that.value;
if (value >= MOD)value -= MOD;
return *this;
}
ModInt& operator-=(ModInt that) {
value -= that.value;
if (value<0)value += MOD;
return *this;
}
ModInt& operator*=(ModInt that) {
value = (int)((long long)value * that.value % MOD);
return *this;
}
ModInt &operator/=(ModInt that) {
return *this *= that.inverse();
}
ModInt operator+(ModInt that) const {
return ModInt(*this) += that;
}
ModInt operator-(ModInt that) const {
return ModInt(*this) -= that;
}
ModInt operator*(ModInt that) const {
return ModInt(*this) *= that;
}
ModInt operator/(ModInt that) const {
return ModInt(*this) /= that;
}
ModInt pow(long long k) const {
ModInt n = *this, res = 1;
while (k) {
if (k & 1)res *= n;
n *= n;
k >>= 1;
}
return res;
}
ModInt inverse() const {
long long a = value, b = MOD, u = 1, v = 0;
while (b) {
long long t = a / b;
a -= t * b;
swap(a, b);
u -= t * v;
swap(u, v);
}
return ModInt(u);
}
int toi() const { return value; }
private:
int value;
};
typedef ModInt<1000000007> mint;
ostream& operator<<(ostream& os, const mint& x) {
os << x.toi();
return os;
}
void solve() {
int N, M, K;
cin >> N >> M >> K;
vi L(M), R(M);
rep(i, M) {
cin >> L[i] >> R[i];
--L[i];
}
vector<mint> cu(N + 1), ne(N + 1), sm(N + 1);
cu[0] = 1;
rep(i, K) {
fill(all(ne), 0);
fill(all(sm), 0);
rep(j, N) {
sm[j + 1] = cu[j] + sm[j];
}
rep(j, M) {
mint from = sm[R[j]] - sm[L[j]];
ne[L[j]] += from;
ne[R[j]] -= from;
}
rep(j, N)ne[j + 1] += ne[j];
swap(cu, ne);
}
cout << cu[N - 1] << endl;
}
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
cout << fixed << setprecision(15);
solve();
return 0;
}