Submission #72883

#	Time	Username	Problem	Language	Result	Execution time	Memory
72883		arman_ferdous	Calvinball championship (CEOI15_teams)	C++17	100 / 100	544 ms	1288 KiB

teams

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

const int N = 1e4+10;
const int mod = 1e6+7;

int n, arr[N], pre[N];
long long dp[2][N];

int main() {
	scanf("%d", &n);
	pre[0] = -1;
	for(int i = 1; i <= n; i++) {
		scanf("%d", &arr[i]);
		pre[i] = max(pre[i-1], arr[i]);
	}

	for(int i = 0; i < N; i++)
		dp[0][i] = 1;

	int ro = 1, ans = 0;
	for(int i = n-1; i > 0; i--) {
		for(int val = 1; val <= n; val++)
			dp[ro][val] = ( val * dp[ro^1][val] + dp[ro^1][val+1] ) % mod;
		for(int val = 1; val < arr[i+1]; val++) 
			ans = (ans + dp[ro^1][max(pre[i],val)]) % mod;
		ro ^= 1;
	} printf("%d\n", ans + 1);
	return 0;
}

Compilation message (stderr)

teams.cpp: In function 'int main()':
teams.cpp:11:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
teams.cpp:14:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &arr[i]);
   ~~~~~^~~~~~~~~~~~~~~

• 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: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10