Submission #61694

#	Time	Username	Problem	Language	Result	Execution time	Memory
61694		Mamnoon_Siam	Calvinball championship (CEOI15_teams)	C++17	100 / 100	311 ms	2368 KiB

teams

//#pragma GCC optimize("Ofast,unroll-loops,no-stack-protector")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

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

#define debug(s) cout << #s << " = " << s << endl
#define all(v) (v).begin(), (v).end()
#define KeepUnique(v) (v).erase( unique(all(v)), v.end() )
#define MEMSET(a, val) memset(a, val, sizeof (a))
#define PB push_back
#define endl '\n'
typedef long long ll;

inline int myrand(int l, int r) {
	int ret = rand(); ret <<= 15; ret ^= rand();
	if(ret < 0) ret = -ret; ret %= (r-l+1); ret += l;
	return ret;
}

template <typename F, typename S>
ostream& operator << (ostream& os, const pair< F, S>& p) {
	return os<<"(" <<p.first<<", "<<p.second<<")"; }

typedef pair<int, int> ii;

template<typename T> using min_pq =
	std::priority_queue<T, vector<T>, greater<T> >;

//int dx[] = {-1, +0, +1, +0};
//int dy[] = {+0, +1, +0, -1};

const int maxn = 10005;
const int mod = 1000007;

int dp[2][maxn];

int32_t main () {
	// freopen("in", "r", stdin);

	int n;
    cin >> n;
    vector<int> v(n);
    for(int &b : v) cin >> b;

    if(n == 2) {
    	int ans;
    	if(v[0] == 1 and v[1] == 1) ans = 1;
    	else ans = 2;
    	cout << ans << endl;
    	return 0;
    }

	vector<int> pre(n, v[0]);
	map<int, map<int, int>> mp;

	for(int i = 1; i < n; i++) {
		pre[i] = max(pre[i - 1], v[i]);
	}

    for(int i = 0; i <= n; i++) dp[0][i] = 1;
   	mp[n][pre[n - 2]] = 1;
    
    int tog = 1;
    for(int p = n - 1; p >= 0; p--) {
    	for(int k = 0; k <= n; k++) {
    		dp[tog][k] = (dp[tog ^ 1][k + 1] + 1LL * k * dp[tog ^ 1][k]) % mod;
    	}
    	if(p <= 1) mp[p][0] = dp[tog][0];
    	else mp[p][pre[p - 2]] = dp[tog][pre[p - 2]];
    	tog ^= 1;
    }

    int ret = 0, mx = 0;
    for(int i = 0; i < n; i++) {
    	ret = (ret + 1LL * (v[i] - 1) * mp[i + 1][mx]) % mod;
    	mx = max(mx, v[i]);
    }
    ret++;
    if(ret == mod) ret = 0;

    cout << ret << endl;
}

Compilation message (stderr)

teams.cpp: In function 'int myrand(int, int)':
teams.cpp:18:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if(ret < 0) ret = -ret; ret %= (r-l+1); ret += l;
  ^~
teams.cpp:18:26: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
  if(ret < 0) ret = -ret; ret %= (r-l+1); ret += l;
                          ^~~

• 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