Submission #585588

#	Time	Username	Problem	Language	Result	Execution time	Memory
585588		talant117408	Building Bridges (CEOI17_building)	C++17	0 / 100	48 ms	5932 KiB

building

#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
 
#define pb                  push_back
#define mp                  make_pair
#define all(v)              (v).begin(),(v).end()
#define rall(v)             (v).rbegin(),(v).rend()
#define lb                  lower_bound
#define ub                  upper_bound
#define sz(v)               int((v).size())
#define do_not_disturb      ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define endl                '\n'
 
const int N = 1e6 + 7;
 
struct line {
    ll m, b;
    line() {}
    line(ll _m, ll _b) {
        m = _m; b = _b;
    }
    ll operator()(ll x) {
        return m * x + b;
    }
} tree[N * 4];
 
void update(int v, int l, int r, line seg) {
    if (l == r - 1) {
        if (seg(l) < tree[v](l))
            tree[v] = seg;
        return;
    }
    int mid = (l + r) >> 1;
    if (seg.m > tree[v].m) 
        swap(seg, tree[v]);
    if (tree[v](mid) > seg(mid)) {
        swap(seg, tree[v]);
        update(v * 2, l, mid, seg);
    }
    else {
        update(v * 2 + 1, mid, r, seg);
    }
}
 
ll get(int v, int l, int r, ll x) {
    if (l == r - 1) {
        return tree[v](x);
    }
    int mid = (l + r) >> 1;
    if (x < mid) return min(tree[v](x), get(v * 2, l, mid, x));
    else return min(tree[v](x), get(v * 2 + 1, mid, r, x));
}
 
void solve() {
    int n;
    cin >> n;
    vector <ll> h(n), w(n), pref(n);
    for (auto &to : h) cin >> to;
    for (auto &to : w) cin >> to;
    for (int i = 0; i < n; i++) {
        pref[i] = w[i];
      	if (i) pref[i] += pref[i - 1];
    }
    
    vector <ll> dp(n, 2e18);
    dp[0] = 0;
    update(1, 0, N, line(-2 * h[0], dp[0] - pref[0] + h[0] * h[0]));
    for (int i = 1; i < n; i++) {
        dp[i] = get(1, 0, N, h[i]) + pref[i - 1] + h[i] * h[i];
        update(1, 0, N, line(-2 * h[i], dp[i] - pref[i] + h[i] * h[i]));
    }
    cout << dp[n - 1];
}

int main() {
    do_not_disturb
    
    int t = 1;
    //~ cin >> t;
    while (t--) {
        solve();
    }
    
    return 0;
}

• Subtask 1: 0 / 30
• Subtask 2: 0 / 30
• Subtask 3: 0 / 40