Submission #431278

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
431278	2021-06-17 10:41:08	keko37	Tents (JOI18_tents)	C++14	100 / 100	205 ms	63340 KiB

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#include<bits/stdc++.h>
using namespace std;
const int MOD = 1000000007;
typedef long long llint;
const int MAXN = 3005;
int add (int a, int b) {a += b; if (a >= MOD) return a - MOD; return a;}
int sub (int a, int b) {a -= b; if (a < 0) return a + MOD; return a;}
int mul (int a, int b) {return (llint) a * b % MOD;}
int n, m;
int fact[MAXN], pot[MAXN];
int nck[MAXN][MAXN], dp[MAXN][MAXN];
void precompute () {
  fact[0] = 1;
  pot[0] = 1;
  for (int i = 1; i < MAXN; i++) {
    fact[i] = mul(fact[i - 1], i);
    pot[i] = mul(pot[i - 1], (MOD + 1) / 2);
  }
  for (int i = 0; i < MAXN; i++) {
    nck[i][0] = nck[i][i] = 1;
    for (int j = 1; j < i; j++) {
      nck[i][j] = add(nck[i - 1][j], nck[i - 1][j - 1]);
    }
 
 
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• Subtask 1: 48 / 48
• Subtask 2: 52 / 52