제출 #612776

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
612776	2022-07-30 00:54:33	stevancv	Tents (JOI18_tents)	C++14	100 / 100	599 ms	40668 KiB

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#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
#define smin(a, b) a = min(a, b)
#define smax(a, b) a = max(a, b)
using namespace std;
const int N = 3e3 + 2;
const int mod = 1e9 + 7;
int Add(int a, int b) {
    a += b;
    if (a >= mod) a -= mod;
    if (a < 0) a += mod;
    return a;
}
int Mul(int a, int b) {
    ll c = a; c *= b; c %= mod;
    return c;
}
bool was[N][N];
int dp[N][N];
int Solve(int a, int b) {
    if (a <= 0 || b <= 0) return 1;
    if (a == 1 && b == 1) return 5;
    if (was[a][b]) return dp[a][b];
    was[a][b] = 1;
    int ans = Solve(a - 1, b);
    ll k = 4 * b;
    ans = Add(ans, Mul(Solve(a - 1, b - 1), k));
 
 
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• Subtask 1: 48 / 48
• Subtask 2: 52 / 52