# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
43835 | PowerOfNinjaGo | Calvinball championship (CEOI15_teams) | C++14 | 520 ms | 1096 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
//Power Of Ninja Go
#include <bits/stdc++.h>
//#ifdef atom #else #endif
using namespace std;
typedef long long ll; typedef pair<int, int> ii;
#define X first
#define Y second
#define vi vector<int>
#define vii vector< ii >
#define pb push_back
const int md = 1e6+7;
void add(int &a, int b)
{
a += b;
if(a>= md) a -= md;
}
int mul(int a, int b)
{
return (1LL*a*b)%md;
}
const int maxn = 1e4+5;
int arr[maxn];
int dp[2][maxn];
int k[maxn];
int main()
{
//#ifndef atom freopen(".in", "r", stdin); freopen(".out", "w", stdout); #endif
int n; scanf("%d", &n);
//while(1)
{
for(int i = 1; i<= n; i++) scanf("%d", &arr[i]);
for(int i = 1; i<= n; i++) k[i] = max(k[i-1], arr[i-1]);
for(int i = 1; i<= n+1; i++) dp[(n+1)%2][i] = 1;
int ans = 0;
for(int i = n; i>= 1; i--)
{
int f = i%2;
for(int j = 0; j<= i; j++)
{
dp[f][j] = dp[1-f][j+1];
add(dp[f][j], mul(j, dp[1-f][j]));
//printf("dp[%d][%d] = %d\n", i, j, dp[f][j]);
}
if(k[i]< arr[i])
{
add(ans, mul(k[i], dp[1-f][k[i]]));
//printf("ans is now %d\n", ans);
}
else
{
add(ans, mul(arr[i]-1, dp[1-f][k[i]]));
}
}
printf("%d\n", ans+1);
}
}
Compilation message (stderr)
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