Submission #585838

#	Time	Username	Problem	Language	Result	Execution time	Memory
585838		MilosMilutinovic	Calvinball championship (CEOI15_teams)	C++14	100 / 100	367 ms	492 KiB

teams

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <cmath>
#include <vector>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <queue>
#include <ctime>
#include <cassert>
#include <complex>
#include <string>
#include <cstring>
#include <chrono>
#include <random>
#include <bitset>
#include <array>
using namespace std;
 
#ifdef LOCAL
	#define eprintf(...) {fprintf(stderr, __VA_ARGS__);fflush(stderr);}
#else
	#define eprintf(...) 42
#endif
 
using ll = long long;
using ld = long double;
using uint = unsigned int;
using ull = unsigned long long;
template<typename T>
using pair2 = pair<T, T>;
using pii = pair<int, int>;
using pli = pair<ll, int>;
using pll = pair<ll, ll>;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myRand(ll B) {
	return (ull)rng() % B;
}
 
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define fi first
#define se second
 
clock_t startTime;
double getCurrentTime() {
	return (double)(clock() - startTime) / CLOCKS_PER_SEC;
}

const int MOD = 1000007;

int add(int x, int y) {
	return x + y < MOD ? x + y : x + y - MOD;
}
int mul(int x, int y) {
	return (ll)x * y % MOD;
}

const int N = 10500;
int a[N], b[N];
int n;
int dp[2][N];

int main() 
{
	startTime = clock();
//	freopen("input.txt", "r", stdin);
//	freopen("output.txt", "w", stdout);

	scanf("%d", &n);
	for (int i = 0; i < n; i++) {
		scanf("%d", &a[i]);
	}
	b[0] = 0;
	for (int i = 1; i < n; i++)
		b[i] = max(b[i - 1], a[i - 1]);
	for (int v = 1; v <= n; v++)
		dp[n & 1][v] = 1;
	int ans = 1;
	for (int i = n - 1; i >= 0; i--) {
		for (int v = 1; v < a[i]; v++) {
			ans = add(ans, dp[(i + 1) & 1][max(b[i], v)]);
		}
		for (int v = 1; v <= n; v++)
			dp[i & 1][v] = 0;
		for (int v = 1; v <= n; v++) {
			dp[i & 1][v] = add(dp[(i + 1) & 1][v + 1], mul(v, dp[(i + 1) & 1][v]));
		}
	}
	printf("%d\n", ans);

	return 0;
}

Compilation message (stderr)

teams.cpp: In function 'int main()':
teams.cpp:74:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~
teams.cpp:76:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |   scanf("%d", &a[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