제출 #1265076

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1265076		CrabCNH	Examination (JOI19_examination)	C++20	100 / 100	232 ms	31088 KiB

examination

#include <bits/stdc++.h>

#define task     "BriantheCrab"

#define int    long long
#define pii    pair <int, int>
#define fi     first
#define se     second
#define szf    sizeof
#define sz(s)  (int)((s).size())
#define all(v) (v).begin(), (v).end()

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;

using namespace std;

template <class T> void minimize (T &t, T f) {if (t > f) t = f;}
template <class T> void maximize (T &t, T f) {if (t < f) t = f;}

const int maxN = 1e6 + 5;
const int inf = 1e18 + 7;
const int mod = 1e9 + 7;

// khong tu code thi khong kha len duoc dau
// biet sol roi thi tu lam not di

struct Point {
    int x, y, z;
    int id, t;
};

bool cmp (Point A, Point B) { 
    if (A.x != B.x) { 
        return A.x > B.x; 
    } 
    return A.t < B.t;
}

struct Fenwick {
    int bit[maxN];
    
    void upd (int id, int val) {
        for (; id < maxN; id += id & (-id)) {
            bit[id] += val;
        }
    }
    
    int get (int id) {
        int res = 0;
        for (; id; id -= id & (-id)) {
            res += bit[id];
        }
        return res;
    }
} T;

int Z;
int n, q;
vector <Point> v;
int res[maxN];

void cdq (int l, int r) {
    //cout << l << ' ' << r << '\n';
    if (l == r) {
        return;
    }
    int m = (l + r) >> 1;
    cdq (l, m), cdq (m + 1, r);
    int lp = l, rp = m + 1;
    vector <Point> tmp;
    vector <int> reset;
    while (lp <= m && rp <= r) {
        if (v[lp].y >= v[rp].y) {
            if (v[lp].t == 0) {
                T.upd (v[lp].z, 1);
                reset.push_back (v[lp].z);
            }
            tmp.push_back (v[lp ++]);
        }
        else {
            if (v[rp].t == 1) { 
                res[v[rp].id] += T.get (Z) - T.get (v[rp].z - 1);
            }
            tmp.push_back (v[rp ++]);
        }
    }
    while (lp <= m) {
        tmp.push_back (v[lp ++]);
    }
    while (rp <= r) {
        if (v[rp].t == 1) {
            res[v[rp].id] += T.get (Z) - T.get (v[rp].z - 1);
        }
        tmp.push_back (v[rp ++]);
    }
    for (int i = l; i <= r; i ++) {
        v[i] = tmp[i - l];
    }
    for (auto it : reset) {
        T.upd (it, -1);
    }
}

Point a[maxN];

void solve () {
    cin >> n >> q;
    vector <int> zip;
    for (int i = 1; i <= n; i ++) {
        int x, y, z;
        cin >> x >> y;
        z = x + y;
        v.push_back ({x, y, z, i, 0});
        zip.push_back (z);
    }
    for (int i = n + 1; i <= n + q; i ++) {
        int x, y, z;
        cin >> x >> y >> z;
        v.push_back ({x, y, z, i, 1});
        zip.push_back (z);
    }
    sort (all (zip));
    zip.erase (unique (all (zip)), zip.end ());
    Z = sz (zip) + 1;
    for (int i = 0; i < n + q; i ++) {
        v[i].z = lower_bound (all (zip), v[i].z) - zip.begin () + 1;
    }
    sort (all (v), cmp);
    cdq (0, n + q - 1);
    for (int i = n + 1; i <= n + q; i ++) {
        cout << res[i] << '\n';
    }
    return;
}

signed main () {
    cin.tie (nullptr) -> sync_with_stdio (false);
    if (fopen (task".inp", "r")) {
        freopen (task".inp", "r", stdin);
        freopen (task".out", "w", stdout);
    }
    int t = 1;
    //cin >> t;
    while (t --) {
        solve ();
    } 
    return 0;
}
// thfv

컴파일 시 표준 에러 (stderr) 메시지

examination.cpp: In function 'int main()':
examination.cpp:141:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  141 |         freopen (task".inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
examination.cpp:142:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  142 |         freopen (task".out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 2 / 2
• Subtask 2: 20 / 20
• Subtask 3: 21 / 21
• Subtask 4: 57 / 57