제출 #749315

#제출 시각아이디문제언어결과실행 시간메모리
749315Desh03Growing Vegetables is Fun 4 (JOI21_ho_t1)C++17
0 / 100
1 ms212 KiB
#include <bits/stdc++.h> using namespace std; template <typename T> struct fenwick { vector<T> fen; int n; fenwick(int n_) : n(n_) { fen.resize(n); } void upd(int x, int d) { while (x < n) { fen[x] += d; x |= x + 1; } } T qry(int x) { T s = 0; while (x >= 0) { s += fen[x]; x = (x & (x + 1)) - 1; } return s; } void upd(int l, int r, int d) { upd(l, d); upd(r + 1, -d); } }; int main() { ios_base::sync_with_stdio(false); cin.tie(0); int n; cin >> n; vector<int> a(n); fenwick<int> fen(n); for (int i = 0; i < n; i++) cin >> a[i], fen.upd(i, i, a[i]); int ans = 0; for (int i = 1, j = n - 1;; i++) { int a = fen.qry(i - 1), b = fen.qry(i); while (a >= b) { while (j && fen.qry(j - 1) > fen.qry(j)) --j; if (j < i) break; if (j == i) { if (a == b) ans++; break; } int w = fen.qry(j), w2 = fen.qry(j - 1); if (w - w2 >= a - b) { fen.upd(i, j - 1, a - b + 1); ans += a - b + 1; break; } fen.upd(i, j - 1, w - w2 + 1); ans += w - w2 + 1, b += w - w2 + 1; } if (j <= i) break; } cout << ans << '\n'; }
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