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답안 #973611

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
973611 2024-05-02T08:29:40 Z Ghetto Building Bridges (CEOI17_building) C++17
100 / 100
 91 ms 18632 KB 
#include <bits/stdc++.h>
using namespace std;
using lint = long long;
using pll = pair<lint, lint>;
const int MAX_N = 1e5 + 5;
const lint MAX_H = 1e6 + 5, INF = 2e18;

int n;
lint h[MAX_N], w[MAX_N];

pll lct[60 * MAX_H];
int n_nodes, l_child[60 * MAX_H], r_child[60 * MAX_H];
void propogate(int u) {
    if (l_child[u]) return;
    n_nodes++, l_child[u] = n_nodes, lct[n_nodes] = {0, INF};
    n_nodes++, r_child[u] = n_nodes, lct[n_nodes] = {0, INF};
}
lint eval(pll x, lint y) {
    return x.first * y + x.second;
}
void update(pll x, int u = 1, lint lo = 0, lint hi = MAX_H) {
    lint mid = (lo + hi) / 2;
    if (eval(x, mid) < eval(lct[u], mid)) swap(x, lct[u]);
    if (lo == hi) return;
    propogate(u);
    if (eval(x, lo) < eval(lct[u], lo)) update(x, l_child[u], lo, mid);
    else update(x, r_child[u], mid + 1, hi);
}
lint query(lint i, int u = 1, lint lo = 0, lint hi = MAX_H) {
    if (i < lo || i > hi) return INF;
    if (lo == hi) return eval(lct[u], lo);
    propogate(u);
    lint mid = (lo + hi) / 2;
    return min({eval(lct[u], i), query(i, l_child[u], lo, mid), query(i, r_child[u], mid + 1, hi)});
}
void init() {
    n_nodes = 1;
    lct[1] = {0, INF};
}
lint dp[MAX_N];

int main() {
    cin >> n;
    for (int i = 1; i <= n; i++) cin >> h[i];
    for (int i = 1; i <= n; i++) cin >> w[i];

    init();
    dp[1] = -w[1];
    update({-2 * h[1], dp[1] + h[1] * h[1]});
    for (int i = 2; i <= n; i++) {
        dp[i] = query(h[i]) + h[i] * h[i] - w[i];
        update({-2 * h[i], dp[i] + h[i] * h[i]});
    }

    lint ans = dp[n];
    for (int i = 1; i <= n; i++) ans += w[i];
    cout << ans << '\n';
}

Subtask #1
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 6488 KB Output is correct
2 Correct 2 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 2 ms 6492 KB Output is correct
5 Correct 2 ms 6492 KB Output is correct

Subtask #2
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 66 ms 9240 KB Output is correct
2 Correct 67 ms 9296 KB Output is correct
3 Correct 66 ms 9292 KB Output is correct
4 Correct 63 ms 9040 KB Output is correct
5 Correct 64 ms 14292 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 6488 KB Output is correct
2 Correct 2 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 2 ms 6492 KB Output is correct
5 Correct 2 ms 6492 KB Output is correct
6 Correct 66 ms 9240 KB Output is correct
7 Correct 67 ms 9296 KB Output is correct
8 Correct 66 ms 9292 KB Output is correct
9 Correct 63 ms 9040 KB Output is correct
10 Correct 64 ms 14292 KB Output is correct
11 Correct 76 ms 12136 KB Output is correct
12 Correct 71 ms 11856 KB Output is correct
13 Correct 63 ms 9344 KB Output is correct
14 Correct 91 ms 12144 KB Output is correct
15 Correct 61 ms 18632 KB Output is correct
16 Correct 61 ms 14236 KB Output is correct
17 Correct 57 ms 9044 KB Output is correct
18 Correct 65 ms 9292 KB Output is correct