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답안 #938146

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
938146 2024-03-04T23:37:40 Z Whisper Building Bridges (CEOI17_building) C++17
100 / 100
 48 ms 70540 KB 
#include <bits/stdc++.h>

using namespace std;
using ll = long long;
using ld = long double;
using T = tuple<ll, ll, ll>;

#define int long long
#define Base 41
#define sz(a) (int)a.size()
#define FOR(i, a, b) for ( int i = a ; i <= b ; i++ )
#define FORD(i, a, b) for (int i = a; i >= b; i --)
#define all(x) x.begin() , x.end()
#define pii pair<int , int>
#define fi first
#define se second
#define Lg(x) 31 - __builtin_clz(x)

constexpr ll LINF = (1ll << 60);
constexpr int INF = (1ll << 30);
constexpr int MAX = 1e6 + 5;
constexpr int Mod = 1e9 + 7;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

void setupIO(){
    #define name "Whisper"
    //Phu Trong from Nguyen Tat Thanh High School for gifted student
    srand(time(NULL));
    cin.tie(nullptr)->sync_with_stdio(false); cout.tie(nullptr);
    //   freopen(name".inp", "r", stdin);
    //   freopen(name".out", "w", stdout);
    cout << fixed << setprecision(10);
}

bool minimize(int&a , int b){
    if (a > b){
        a = b; return 1;
    }
    return 0;
}

bool maximize(int&a, int b){
    if (a < b){
        a = b; return 1;
    }
    return 0;
}

int n;
int h[MAX], w[MAX];
int s[MAX];
int dp[MAX];
struct Line{
    int a, b;
    Line():a(0), b(LINF){};
    Line(int _a, int _b){
        a = _a;
        b = _b;
    }

    int f(int x){
        return a * x + b;
    }
};
struct LichaoTree{
    // query for min
    int n;
    vector<Line> f;
    LichaoTree(int _n){
        this -> n = _n;
        f.resize(4 * n + 5);
    }

    void addLine(int id, int l, int r, Line line){
        // nếu là max chỉ cần đổi dấu
        if (l == r){
            if (line.f(l) < f[id].f(l)) f[id] = line;
            return;
        }
        int mid = (l + r) >> 1;
        if (line.a > f[id].a) swap(line, f[id]);
        if (line.f(mid) < f[id].f(mid)){
            swap(line, f[id]);
            addLine(id << 1, l, mid, line);
        }
        else{
            addLine(id << 1 | 1, mid + 1, r, line);
        }
    }

    int qry(int id, int l, int r, int x){
        int ans = f[id].f(x);
        if (l == r) return ans;
        int mid = (l + r) >> 1;
        if (x <= mid)
            return min(ans, qry(id << 1, l, mid, x));
        return min(ans, qry(id << 1 | 1, mid + 1, r, x));
    }

    void addLine(int a, int b){
        addLine(1, 1, n, Line(a, b));
    }
    int qry(int x){
        return qry(1, 1, n, x);
    }
};
namespace SUB1{
    void solve(){
        auto cal = [&](int i, int j){
            return (h[i] - h[j]) * (h[i] - h[j]) - w[j];
        };


        memset(dp, 0x3f, sizeof dp);
        dp[1] = 0;
        for (int i = 2; i <= n; ++i){
            for (int j = 1; j < i; ++j){
                dp[i] = min(dp[i], dp[j] + cal(j, i));
            }
            cout << dp[i] << " ";
        }
        cout << dp[n] + accumulate(w + 2, w + n + 1, 0ll) << " ";
    }
}

void Whisper(){
    cin >> n;
    for (int i = 1; i <= n; ++i) cin >> h[i];
    for (int i = 1; i <= n; ++i) cin >> w[i];
    LichaoTree lichao(MAX);
    lichao.addLine(-2 * h[1], h[1] * h[1]);
//    SUB1 :: solve();
//    cout << '\n';
    for (int i = 2; i <= n; i++){
        dp[i] = lichao.qry(h[i]) + h[i] * h[i] - w[i];
        lichao.addLine(-2 * h[i], h[i] * h[i] + dp[i]);
//        cout << dp[i] << " ";
    }
    cout << dp[n] + accumulate(w + 2, w + n + 1, 0ll);
}


signed main(){
    setupIO();
    int Test = 1;
//    cin >> Test;
    for ( int i = 1 ; i <= Test ; i++ ){
        Whisper();
        if (i < Test) cout << '\n';
    }
}

Subtask #1
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 22 ms 67164 KB Output is correct
2 Correct 10 ms 67052 KB Output is correct
3 Correct 11 ms 67160 KB Output is correct
4 Correct 13 ms 67164 KB Output is correct
5 Correct 12 ms 67196 KB Output is correct

Subtask #2
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 42 ms 70232 KB Output is correct
2 Correct 40 ms 70232 KB Output is correct
3 Correct 40 ms 70392 KB Output is correct
4 Correct 38 ms 70220 KB Output is correct
5 Correct 35 ms 70344 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 22 ms 67164 KB Output is correct
2 Correct 10 ms 67052 KB Output is correct
3 Correct 11 ms 67160 KB Output is correct
4 Correct 13 ms 67164 KB Output is correct
5 Correct 12 ms 67196 KB Output is correct
6 Correct 42 ms 70232 KB Output is correct
7 Correct 40 ms 70232 KB Output is correct
8 Correct 40 ms 70392 KB Output is correct
9 Correct 38 ms 70220 KB Output is correct
10 Correct 35 ms 70344 KB Output is correct
11 Correct 48 ms 70480 KB Output is correct
12 Correct 44 ms 70288 KB Output is correct
13 Correct 39 ms 70456 KB Output is correct
14 Correct 48 ms 70540 KB Output is correct
15 Correct 34 ms 70228 KB Output is correct
16 Correct 33 ms 70224 KB Output is correct
17 Correct 31 ms 70480 KB Output is correct
18 Correct 28 ms 70372 KB Output is correct