제출 #246028

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
246028	2020-07-08 03:46:37	wwdd	Boat (APIO16_boat)	C++14	100 / 100	614 ms	12664 KiB

boat

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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MN = 510;
const ll M = 1e9+7;
ll dp[2][MN*2][MN];
ll cof[MN*2][MN];
ll nv[MN],sz[2*MN];
inline ll mul(ll a, ll b) {return (a*b)%M;}
ll bp(ll b, ll p) {
  ll ac = 1;
  while(p) {
    if(p&1) {ac = mul(ac,b);}
    b = mul(b,b);
    p >>= 1;
  }
  return ac;
}
ll inv(ll v) {return bp(v,M-2);}
void pre(int pct, int n) {
  for(int i=1;i<=n+1;i++) {
    nv[i] = inv(i);
  }
  for(int i=0;i<pct-1;i++) {
    cof[i][0] = sz[i];
  }
  for(int i=1;i<=n;i++) {
    for(int j=0;j<pct-1;j++) {
      cof[j][i] = mul(cof[j][i-1],mul(sz[j]-i,nv[i+1]));
    }
 
 
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• Subtask 2: 22 / 22
• Subtask 3: 27 / 27
• Subtask 4: 42 / 42