Submission #1246758

#	Time	Username	Problem	Language	Result	Execution time	Memory
1246758		BuiDucManh123	Examination (JOI19_examination)	C++17	100 / 100	195 ms	24616 KiB

examination

#include <bits/stdc++.h>
#define fi first
#define se second
#define ll long long
#define ull unsigned long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pb push_back
#define taskname ""
#define ld long double
const int mod = 1e9+7;
using namespace std;

#define int ll
struct Q {
    int x, y, z;
    int id;
    int type;
};

vector<Q> qs;
vector<ll> ans;
vector<int> bit;
int M;
void update(int i, int v) {
    for (; i <= M; i += i & -i)
        bit[i] += v;
}

int get(int i) {
    int s = 0;
    for (; i > 0; i -= i & -i)
        s += bit[i];
    return s;
}

void cdq(int l, int r) {
    if (l >= r) return;
    int m = (l + r) >> 1;
    cdq(l, m);
    cdq(m + 1, r);

    vector<Q> tmp;
    tmp.reserve(r - l + 1);

    int i = l, j = m + 1, added = 0;
    vector<int> to_clear;

    while (i <= m && j <= r) {
        if (qs[i].y >= qs[j].y) {
            if (qs[i].type == 0) {
                update(qs[i].z, 1);
                to_clear.pb(qs[i].z);
                added++;
            }
            tmp.pb(qs[i++]);
        } else {
            if (qs[j].type == 1) {
                ans[qs[j].id] += added - get(qs[j].z - 1);
            }
            tmp.pb(qs[j++]);
        }
    }
    while (i <= m) tmp.pb(qs[i++]);
    while (j <= r) {
        if (qs[j].type == 1) {
            ans[qs[j].id] += added - get(qs[j].z - 1);
        }
        tmp.pb(qs[j++]);
    }

    for (int z : to_clear) update(z, -1);
    for (int k = 0; k < tmp.size(); k++)
        qs[l + k] = tmp[k];
}

signed main() {
    if (fopen(taskname".inp","r")) {
        freopen(taskname".inp","r",stdin);
        freopen(taskname".out","w",stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    int n, q;
    cin >> n >> q;
    qs.reserve(n + q);
    ans.assign(q, 0LL);
    vector<int> allz;

    for (int i = 0; i < n; i++) {
        int S, T; cin >> S >> T;
        qs.pb({S, T, S + T, -1, 0});
        allz.pb(S + T);
    }
    for (int i = 0; i < q; i++) {
        int A, B, C; cin >> A >> B >> C;
        qs.pb({A, B, C, i, 1});
        allz.pb(C);
    }

    sort(allz.begin(), allz.end());
    allz.erase(unique(allz.begin(), allz.end()), allz.end());
    M = allz.size() + 2;
    bit.assign(M + 1, 0);
    for (auto &e : qs)
        e.z = lower_bound(allz.begin(), allz.end(), e.z) - allz.begin() + 1;

    sort(qs.begin(), qs.end(), [](auto &a, auto &b){
        if (a.x != b.x) return a.x > b.x;
        if (a.y != b.y) return a.y > b.y;
        return a.type < b.type;
    });

    cdq(0, qs.size() - 1);

    for (int i = 0; i < q; i++)
        cout << ans[i] << "\n";
    return 0;
}

Compilation message (stderr)

examination.cpp: In function 'int main()':
examination.cpp:79:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |         freopen(taskname".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
examination.cpp:80:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |         freopen(taskname".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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