結果
問題 | No.1202 お菓子の食べ方 |
ユーザー |
![]() |
提出日時 | 2020-08-28 23:12:31 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 366 ms / 2,000 ms |
コード長 | 3,405 bytes |
コンパイル時間 | 1,767 ms |
コンパイル使用メモリ | 137,540 KB |
最終ジャッジ日時 | 2025-01-13 19:23:36 |
ジャッジサーバーID (参考情報) |
judge4 / judge3 |
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ファイルパターン | 結果 |
---|---|
other | AC * 45 |
ソースコード
#include <iostream>#include <vector>#include <algorithm>#include <cmath>#include <string>#include <queue>#include <stack>#include <set>#include <map>#include <iomanip>#include <utility>#include <tuple>#include <functional>#include <bitset>#include <cassert>#include <complex>#include <stdio.h>#include <time.h>#include <numeric>#include <random>#include <unordered_map>#include <unordered_set>#define all(a) a.begin(),a.end()#define rep(i, n) for (ll i = 0; i < (n); i++)#define pb push_back#define debug(x) cerr << __LINE__ << ' ' << #x << ':' << x << '\n'#pragma GCC optimize("O3")#pragma GCC optimize("unroll-loops")using namespace std;typedef long long ll;typedef unsigned long long ull;typedef long double ld;typedef pair<ll, ll> P;typedef complex<ld> com;constexpr int inf = 1000000010;constexpr ll INF = 1000000000000000010;constexpr ld eps = 1e-12;constexpr ld pi = 3.141592653589793238;template<class T, class U> inline bool chmax(T &a, const U &b) { if (a < b) { a = b; return true; } return false; }template<class T, class U> inline bool chmin(T &a, const U &b) { if (a > b) { a = b; return true; } return false; }constexpr ll mod = 1000000007;vector<ll> fac, inv, facinv;void modcalc(int n) {fac.resize(n); inv.resize(n); facinv.resize(n);fac[0] = 1; fac[1] = 1; inv[1] = 1;facinv[0] = 1; facinv[1] = 1;for (ll i = 2; i < n; i++) {fac[i] = fac[i - 1] * i % mod;inv[i] = mod - inv[mod % i] * (mod / i) % mod;facinv[i] = facinv[i - 1] * inv[i] % mod;}}ll modinv(ll a) {a %= mod;if (a == 0) abort();if (a < (ll)inv.size()) return inv[a];ll b = mod, u = 1, v = 0;while (b) {ll t = a / b;a -= t * b; swap(a, b);u -= t * v; swap(u, v);}u %= mod;if (u < 0) u += mod;return u;}ll modpow(ll a, ll b, ll m = mod) {ll ans = 1;a %= m;while (b) {if (b & 1) ans = ans * a % m;a = a * a % m;b >>= 1;}return ans;}ll modcomb(ll n, ll k) {if (n < 0 || k < 0 || n < k) return 0;return fac[n] * facinv[k] % mod * facinv[n - k] % mod;}ll modperm(ll n, ll k) {if (n < 0 || k < 0 || n < k) return 0;return fac[n] * facinv[n - k] % mod;}ll modhom(ll n, ll k) {if (n < 0 || k < 0 || n == 0 && k > 0) return 0;if (n == 0 && k == 0) return 1;return fac[n + k - 1] * facinv[k] % mod * facinv[n - 1] % mod;}int main() {cin.tie(0);ios::sync_with_stdio(false);cout << fixed << setprecision(20);modcalc(3000010);int n, m;cin >> n >> m;vector<vector<int>> a(n, vector<int>(m));rep(i, n) rep(j, m) cin >> a[i][j];ll ans = 0;rep(i, m) {ll c = modcomb(i + n - 1, i);c *= modhom(i + n + 1, a[n - 1][i] - 1); c %= mod;ans += c;}rep(i, n) {ll c = modcomb(i + m - 1, i);c *= modhom(i + m + 1, a[i][m - 1] - 1); c %= mod;ans += c;}rep(i, n) {rep(j, m) {int s = a[i][j] - 1;ll c = fac[i + j + s] * facinv[i] % mod * facinv[j] % mod * facinv[s] % mod;ans += c;}}for (int i = 1; i < n; i++) {rep(j, m) {ll c = modcomb(i + j - 1, j);ll t = modhom(i + j + 1, a[i - 1][j] - 1);t -= modhom(i + j + 1, a[i][j] - 1);if (t < 0) t += mod;ans += c * t % mod;}}rep(i, n) {for (int j = 1; j < m; j++) {ll c = modcomb(i + j - 1, i);ll t = modhom(i + j + 1, a[i][j - 1] - 1);t -= modhom(i + j + 1, a[i][j] - 1);if (t < 0) t += mod;ans += c * t % mod;}}cout << ans % mod << '\n';}