이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
#define FOR(v, s, e) for (int v = s; v < e; v++)
#define FOR_REV(v, s, e) for (int v = e - 1; v >= s; v--)
#define MOD 1000007
int n, ans;
int dp[10005][10005];
int pf[10005][10005];
int vals[10005];
int main() {
cin >> n;
FOR(i, 0, n) {
dp[0][i] = 1;
pf[0][i + 1] = pf[0][i] + 1;
}
FOR(i, 1, n) {
FOR(j, 0, n) {
dp[i][j] = pf[i - 1][j + 2];
pf[i][j + 1] = (pf[i][j] + dp[i][j]) % MOD;
}
}
FOR_REV(i, 0, n) {
cin >> vals[i];
}
FOR(i, 0, n) {
ans = (ans + pf[i][vals[i] - 1]) % MOD;
}
cout << (ans + 1) % MOD;
}
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