Submission #1116605

#	Time	Username	Problem	Language	Result	Execution time	Memory
1116605		gdragon	Examination (JOI19_examination)	C++17	100 / 100	486 ms	34664 KiB

examination

#include <bits/stdc++.h>
using namespace std;
#define TASK "long"
#define fi first
#define se second
#define ll long long
#define pb push_back
#define ALL(x) (x).begin(), (x).end()
#define GETBIT(mask, i) ((mask) >> (i) & 1)
#define MASK(i) ((1LL) << (i))
#define SZ(x) ((int)(x).size())
#define mp make_pair
#define CNTBIT(mask) __builtin_popcount(mask)
template<class X, class Y> bool maximize(X &x, Y y){ if (x < y) {x = y; return true;} return false;};
template<class X, class Y> bool minimize(X &x, Y y){ if (x > y) {x = y; return true;} return false;};
typedef pair<int, int> ii;
const int N = 1e5 + 100;
const int INF = 2e9 + 7;
const int mod = 1e9 + 7;
struct BIT2d {
    int n, m;
    vector<vector<int>> nodes, f;
    BIT2d(int _n = 0) {
        n = _n;
        nodes.assign(n + 2, vector<int>());
        f.assign(n + 2, vector<int>());
    }
    void fakeUpdate(int x, int y) {
        for(; x <= n; x += x & -x) nodes[x].push_back(y);
    }
    void init() {
        for(int i = 1; i <= n; i++) {
            nodes[i].push_back(INF);
            sort(ALL(nodes[i]));
            nodes[i].erase(unique(ALL(nodes[i])), nodes[i].end());
            f[i].assign(SZ(nodes[i]) + 1, 0);
        }
    }

    void update(int x, int y, int val) {
        for(int i = x; i <= n; i += i & -i) {
            for(int j = lower_bound(ALL(nodes[i]), y) - nodes[i].begin() + 1; j <= SZ(nodes[i]); j += j & -j) {
                f[i][j] += val;
            }
        }
    }
    int get(int x, int y) {
        int ans = 0;
        for(int i = x; i > 0; i -= i & -i) {
            for(int j = upper_bound(ALL(nodes[i]), y) - nodes[i].begin(); j > 0; j -= j & -j) {
                ans += f[i][j];
            }
        }
        return ans;
    }
} fw;
struct Fenwick {
    int n;
    vector<int> v;
    Fenwick(int _n = 0) {
        n = _n;
        v.assign(n + 5, 0);
    }
    void update(int x, int c) {
        for(; x > 0; x -= x & -x) v[x] += c;
    }
    int get(int x) {
        int ans = 0;
        for(; x <= n; x += x & -x) ans += v[x];
        return ans;
    }
} fw1, fw2;
struct Query {
    int x, y;
    int type;
    int id;
    Query(int _x = 0, int _y = 0, int _type = 0, int _id = 0) {
        x = _x; y = _y; type = _type; id = _id;
    }
};
int n, q;
int ans[N];
pair<int, int> a[N];
vector<pair<int, pair<int, int>>> queries[N];
void read() {
    cin >> n >> q;
    for(int i = 1; i <= n; i++) cin >> a[i].fi >> a[i].se;
}
vector<int> valB, valC;
void compress() {
    for(int i = 1; i <= n; i++) {
        valB.push_back(a[i].se);
        valC.push_back(a[i].fi + a[i].se);
    }
    valB.push_back(INF);
    valC.push_back(INF);
    sort(ALL(valB));
    valB.erase(unique(ALL(valB)), valB.end());
    sort(ALL(valC));
    valC.erase(unique(ALL(valC)), valC.end());
    // cerr << SZ(valB) << ' ' << SZ(valC) << endl;
}
void solve() {
    sort(a + 1, a + n + 1);
    for(int i = 1; i <= q; i++) {
        int A, B, C; cin >> A >> B >> C;
        int p = lower_bound(a + 1, a + n + 1, mp(A, 0)) - a;
        // cerr << p << endl;
        if (p > n) ans[i] = 0;
        else {
            queries[p].push_back({i, mp(B, C)});
        }
    }
    compress();
    fw1 = Fenwick(SZ(valB));
    fw2 = Fenwick(SZ(valC));
    vector<Query> gdragon;
    for(int i = n; i >= 1; i--) {
        int b = lower_bound(ALL(valB), a[i].se) - valB.begin() + 1;
        fw1.update(b, 1);
        int c = lower_bound(ALL(valC), a[i].fi + a[i].se) - valC.begin() + 1;
        fw2.update(c, 1);
        // update(b, c, 1);
        gdragon.push_back(Query(b, c, 0));
        // cerr << "BC: " << b << ' ' << c << endl;
        for(auto &query: queries[i]) {
            int id = query.fi;
            int B = query.se.fi;
            int C = query.se.se;
            B = lower_bound(ALL(valB), B) - valB.begin() + 1;
            C = lower_bound(ALL(valC), C) - valC.begin() + 1;
            // cerr << id << ' ' << B << ' ' << query.se.fi << ' ' << C << ' ' << query.se.se << endl;
            ans[id] = fw1.get(B) + fw2.get(C) - (n - i + 1);
            gdragon.push_back(Query(B - 1, C - 1, 1, id));
            // cerr << id << ' ' << ans[id] << endl;
            // ans[id] += get(B - 1, C - 1);
            // for(int j = i; j <= n; j++) if (a[j].se < query.se.fi && a[j].fi + a[j].se < query.se.se) {
            //     ++ans[id];
            // }
        }
    }
    fw = BIT2d(SZ(valB));
    for(auto &i: gdragon) {
        if (i.type == 0) fw.fakeUpdate(i.x, i.y);
    }
    fw.init();
    for(auto &i: gdragon) {
        if (!i.type) fw.update(i.x, i.y, 1);
        else ans[i.id] += fw.get(i.x, i.y);
    }
    for(int i = 1; i <= q; i++) cout << ans[i] << endl;
}
signed main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    if (fopen(TASK".inp", "r")) {
        freopen(TASK".inp", "r", stdin);
        freopen(TASK".out", "w", stdout);
    }
    int test = 1;
    // cin >> test;
    while(test--) {
        read();
        solve();
    }
    return 0;
}

Compilation message (stderr)

examination.cpp: In function 'int main()':
examination.cpp:156:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  156 |         freopen(TASK".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
examination.cpp:157:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  157 |         freopen(TASK".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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