Submission #460904

#	Time	Username	Problem	Language	Result	Execution time	Memory
460904		kingfran1907	Calvinball championship (CEOI15_teams)	C++14	100 / 100	486 ms	476 KiB

teams

#include <bits/stdc++.h>
#define X first
#define Y second

using namespace std;
typedef long long llint;

const int maxn = 1e4+2;
const int base = 31337;
const int mod = 1e6+7;
const int inf = 0x3f3f3f3f;
const int logo = 18;
const int off = 1 << logo;
const int treesiz = off << 1;

int n;
int niz[maxn];
int dp[2][maxn];
int pref[maxn];

int mul(int a, int b) {
	llint out = (llint) a * b;
	return out % mod;
}

int main() {
	scanf("%d", &n);
	for (int i = 0; i < n; i++) {
		scanf("%d", niz+i);
	}
	pref[0] = niz[0];
	for (int i = 1; i < n; i++) pref[i] = max(pref[i - 1], niz[i]);
	
	int sol = 0;
	for (int i = 1; i <= n; i++) dp[0][i] = 1;
	int cnt = 1;
	for (int i = n - 1; i > 0; i--) {
		sol += mul(niz[i] - 1, dp[(n - i - 1) % 2][pref[i - 1]]);
		sol %= mod;
		
		for (int j = 1; j <= n; j++) 
			dp[cnt][j] = (dp[1 - cnt][j + 1] + mul(j, dp[1 - cnt][j])) % mod;
		cnt = 1 - cnt;
	}
	printf("%d\n", sol + 1);
	return 0;
}

Compilation message (stderr)

teams.cpp: In function 'int main()':
teams.cpp:27:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~
teams.cpp:29:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |   scanf("%d", niz+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