제출 #1122024

#제출 시각아이디문제언어결과실행 시간메모리
1122024AliyyiakbarCalvinball championship (CEOI15_teams)C++17
10 / 100
11 ms12344 KiB
/* #ifndef ONLINE_JUDGE #include "AkbarKING.h" // aska geldi akbarking.h #else #define debug(...) #define debugArr(...) #define debugG(...) #endif */ #include <bits/stdc++.h> #include <ext/pb_ds/assoc_container.hpp> #include <ext/pb_ds/hash_policy.hpp> #define int long long #define $AzH_TxdmN$ ios_base::sync_with_stdio(0);cin.tie(nullptr);cout.tie(nullptr); #pragma GCC target("sse,sse2,sse3,ssse3,popcnt,abm,mmx,tune=native") #pragma GCC optimize("Ofast") #pragma GCC optimize("no-stack-protector") #pragma GCC optimize("unroll-loops") #pragma GCC optimize("fast-math") #define ep emplace_back #define pb push_back #define pii pair<int,int> #define all(v) v.begin(),v.end() #define rall(v) v.rbegin(),v.rend() using namespace std; using namespace __gnu_pbds; template <typename T> using __indexed_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>; template <typename T> using __indexed_multiset = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>; const int sz = 2e3+9; const int LOG = 63; const int MOD = 1e6+7; const int INF = 1e18; int a[sz],dp[sz][sz],sdp[sz]; int n; void solve() { cin>>n; for (int i = 0; i < n; ++i) { cin>>a[i]; } sdp[0] = a[0]; for (int i = 1; i < n; ++i) { sdp[i] = max(sdp[i],sdp[i-1]); } for (int i = 0; i <= n; ++i) { for (int j = 0; j <= n; ++j) { dp[i][j] = 1; } } int res = 1; for (int i = n-1; i >= 1; --i) { if (i != n-1) { for (int j = 1; j <= i+1; ++j) { dp[i][j] = (((dp[i+1][j]*j))%MOD + (dp[i+1][j+1])%MOD)%MOD; } } res = (res+dp[i][sdp[i-1]]*(a[i]-1))%MOD; } cout<<res<<'\n'; } signed main() { $AzH_TxdmN$ int t = 1; //cin>>t; while (t--) { solve(); } }
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