Submission #99750

#	Time	Username	Problem	Language	Result	Execution time	Memory
99750		HardNut	Calvinball championship (CEOI15_teams)	C++17	70 / 100	588 ms	66560 KiB

teams

//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int N = 1e4 + 5;
const ll INF = 1e18 + 5;
const ll mod = 1e6 + 7;
const int tx[] = {1, -1, 0, 0}, ty[] = {0, 0, 1, -1};
const ll bs = 31;

#define int ll

int n, a[N], b[N], cnt, res[N], mx[N];
unordered_map <int, int> dp[10005];

int calc(int id, int mx) {
    if (dp[id][mx])
       return dp[id][mx];
    return dp[id][mx] = (mx * calc(id - 1, mx) % mod + calc(id - 1, mx + 1)) % mod;
}

main() {
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
//        dp[i].reserve(105);
        dp[0][i] = 1;
        mx[i] = max(mx[i - 1], a[i]);
    }
    int ans = 0;
    for (int i = n - 1; i >= 1; i--) {
        ans = (ans + (a[i + 1] - 1) * calc(n - i - 1, mx[i]) % mod) % mod;
    }
    cout << (ans + 1) % mod;
    return 0;
}
/**
5
1 2 1 1 1
*/

Compilation message (stderr)

teams.cpp:26:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^

• 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: 0 / 10
• Subtask 10: 0 / 10