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#include <iostream> #include <vector> using namespace std; const int maxn = 1005; typedef long long ll; const ll MOD = 1e9 + 7; int main() { ios_base::sync_with_stdio(false); int n, K; cin >> n >> K; vector<int> v(n); for(int i = 0; i < n; i++) { cin >> v[i]; } vector<ll> dp(K + 1); dp[0] = 1; for(int at = 0; at < n; at++) { for(int used_candies = K; used_candies >= 0; used_candies--) { ll tmp = dp[used_candies]; int L = used_candies + 1; int R = used_candies + min(v[at], K - used_candies); for(int i = L; i <= R; i++) { dp[i] += tmp; dp[i] %= MOD; } // for(int candy = 1; candy <= min(v[at], K - used_candies); candy++) { // dp[used_candies + candy] += tmp; // dp[used_candies + candy] %= MOD; // } } } cout << dp[K] << endl; return 0; }
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