제출 #1158832

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1158832		JanPham	Building Bridges (CEOI17_building)	C++20	30 / 100	3094 ms	3432 KiB

building

#include <bits/stdc++.h>

using namespace std;

#define pb push_back
#define fi first
#define se second
#define TranLeThanhTam "TranLeThanhTam"
#define all(v) v.begin(),v.end()
#define reset(a,i) memset(a,i,sizeof(a))
#define FOR(i,a,b) for (int i = (a), _b = (b); i <= _b; ++i)
#define FORD(i,a,b) for (int i = (a), _b = (b); i >= _b; --i)
#define compact(v) sort(all(v)), v.erase(unique(all(v)), end(v))
#define sz(v) (int) v.size()
#define MASK(i) (1 << (i))
#define int ll

typedef long long ll;
typedef long double lb;
typedef pair<ll,ll> pll;
typedef pair<int,int> pii;

const int Thanh_Tam = 1e5 + 17;
const int inf = 1e9 + 17;
const long long infll = 1e18 + 17;
const int MOD = 1e9 + 7;
const int Log = 18;
const int dx[4] = {-1, 0, 0, 1};
const int dy[4] = {0, -1, 1, 0};
const int max_block_size = 600;
const ll P = 311;
const int maxA = 1e2 + 17;
const int addi = 1e9;
const char dir[4] = {'W', 'S', 'N', 'E'};
const int Mod[3] = {998244353, MOD, 759186269};

ll mul(ll a, ll b, ll mod);
ll binpow(ll a, ll b, ll mod)
{
    ll res = 1;
    while (b > 0)
    {
        if (b & 1) res = mul(res,a,mod);
        b >>= 1;
        a = mul(a,a,mod);
    }
    return res;
}
ll add(ll a, ll b, ll mod = MOD) { return (a + b) % mod;                 }
ll sub(ll a, ll b, ll mod = MOD) { return (a - b + mod) % mod;          }
ll mul(ll a, ll b, ll mod = MOD) { return ((a % mod) * (b % mod)) % mod; }
ll Div(ll a, ll b, ll mod = MOD) { return mul(a, binpow(b, mod - 2, mod), mod); }

mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rand_range(ll l, ll r) { return uniform_int_distribution<ll>(l,r)(rng); }

struct Line
{
    int a; ll b;
    Line() {}
    Line(int a, ll b) : a(a), b(b) {}
    ll f(int x) { return 1LL * a * x + b; }
};

struct Convex_Hull
{
    int real_size = 0;
    vector<Line> lines;
    stack<pair<pii, Line>> st;

    void init(int n)
    {
        lines.assign(n + 1, Line(0, 0));
        real_size = 1;
        return;
    }

    long double intersect(Line C1, Line C2)
    {
        return (1.0 * (C2.b - C1.b)) / (1.0 * (C1.a - C2.a));
    }

    void add(Line l)
    {
        int tmp = real_size, L = 1, R = real_size - 1;
        while (L <= R)
        {
            int mid = (L + R) >> 1;
            if (intersect(l, lines[mid - 1]) > intersect(l, lines[mid])) 
            {
                tmp = mid;
                R = mid - 1;
            }
            else L = mid + 1;
        }

        st.push({{tmp, real_size}, lines[tmp]});
        real_size = tmp + 1;
        lines[tmp] = l;

        return;
    }

    ll query(ll x)
    {
        int pos = 0, L = 1, R = real_size - 1;
        while (L <= R)
        {
            int mid = (L + R) >> 1;
            if (lines[mid].f(x) <= lines[mid - 1].f(x)) 
            {
                pos = mid;
                L = mid + 1;
            }
            else R = mid - 1;
        }
        
        return lines[pos].f(x);
    }   

    void rollback()
    {
        lines[st.top().fi.fi] = st.top().se;
        real_size = st.top().fi.se;
        st.pop();
        return;
    }

    void print()
    {
        for (Line T : lines)
            cout << T.a << ' ' << T.b << '\n';
        cout << '\n';
        return;
    }

} CHT;

int n;
int h[Thanh_Tam], w[Thanh_Tam], dp[Thanh_Tam], pref[Thanh_Tam];

int get(int l, int r)
{
    if (l > r) return 0;
    return pref[r] - pref[l - 1];
}

int sqr(int x)
{
    return x * x;
}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    if (fopen(TranLeThanhTam".inp","r"))
    {
        freopen(TranLeThanhTam".inp","r",stdin);
        freopen(TranLeThanhTam".out","w",stdout);
    }

    cin >> n;
    FOR(i,1,n) cin >> h[i];
    FOR(i,1,n) cin >> w[i];
    FOR(i,1,n) pref[i] = pref[i - 1] + w[i];

    FOR(i,2,n)
    {
        dp[i] = inf;
        FOR(j, 1, i - 1)
            if (dp[i] > dp[j] + get(j + 1, i - 1) + sqr(h[i] - h[j]))
                dp[i] = dp[j] + get(j + 1, i - 1) + sqr(h[i] - h[j]);
    }
    cout << dp[n];
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

building.cpp: In function 'int main()':
building.cpp:161:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  161 |         freopen(TranLeThanhTam".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
building.cpp:162:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  162 |         freopen(TranLeThanhTam".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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