Submission #527252

#	Time	Username	Problem	Language	Result	Execution time	Memory
527252		maomao90	Calvinball championship (CEOI15_teams)	C++17	80 / 100	1086 ms	460 KiB

teams

#include <bits/stdc++.h>
using namespace std;

#define REP(i, j, k) for (int i = j; i < k; i++)
#define RREP(i, j, k) for (int i = j; i >= k; i--)

template<class T>
inline bool mxto(T &a, T b) {return a < b ? a = b, 1 : 0;}
template<class T>
inline bool mnto(T &a, T b) {return a > b ? a = b, 1 : 0;}

typedef long long ll;
#define FI first
#define SE second
#define MP make_pair
typedef pair<int, int> ii;
#define pb push_back
#define ALL(x) x.begin(), x.end()
typedef vector<int> vi;
typedef vector<ii> vii;

#ifndef DEBUG
#define cerr if (0) cerr
#endif

#define INF 1000000005
#define LINF 1000000000000000005ll
#define MAXN 10005
#define MOD 1000007

int n;
int a[MAXN];

int memo[2][MAXN][2];
int dp(int i, int j, bool same) {
	if (i >= n) {
		return 1;
	}
	if (memo[i & 1][j][same] != -1) {
		return memo[i & 1][j][same];
	}
	int res = 0;
	if (same) {
		res += (ll) dp(i + 1, j, 0) * min(j, a[i] - 1) % MOD;
		if (res >= MOD) {
			res -= MOD;
		}
		if (a[i] <= j + 1) {
			res += dp(i + 1, max(j, a[i]), 1);
			if (res >= MOD) {
				res -= MOD;
			}
		}
	} else {
		res += (ll) dp(i + 1, j, 0) * j % MOD;
		if (res >= MOD) {
			res -= MOD;
		}
		res += dp(i + 1, j + 1, 0);
		if (res >= MOD) {
			res -= MOD;
		}
	}
	return memo[i & 1][j][same] = res;
}

int main() {
#ifndef DEBUG
	ios::sync_with_stdio(0), cin.tie(0);
#endif
	cin >> n;
	REP (i, 0, n) {
		cin >> a[i];
	}
	RREP (i, n - 1, 0) {
		REP (j, 0, i + 1) {
			REP (k, 0, 2) {
				memo[i & 1][j][k] = -1;
				dp(i, j, k);
			}
		}
	}
	cout << memo[0][0][1] << '\n';
	return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 0 / 10
• Subtask 9: 10 / 10
• Subtask 10: 0 / 10