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Submission #983163

# Submission time Handle Problem Language Result Execution time Memory
983163 2024-05-15T08:51:33 Z PanosPask Examination (JOI19_examination) C++14
100 / 100
 598 ms 19028 KB 
#include <bits/stdc++.h>
#define pb push_back

using namespace std;

struct BITree {
    int size;
    vector<int> tree;

    void init(int N) {
        size = N;
        tree.assign(size, 0);
    }

    void add(int i, int v) {
        for (int idx = i; idx < size; idx = idx | (idx + 1)) {
            tree[idx] += v;
        }
    }

    int get(int i) {
        int res = 0;
        for (int idx = i; idx >= 0; idx = (idx & (idx + 1)) - 1) {
            res += tree[idx];
        }

        return res;
    }
    int get(int l, int r) {
        return get(r - 1) - get(l - 1);
    }
    int rget(int i) {
        return get(i, size);
    }
};

const int STUDENT = 0;
const int QUERY = 1;

struct Event {
    int type;
    int x, y;
    int z;

    // For queries only
    int id = -1;
};

bool sumsort(const Event& a, const Event& b)
{
    if (a.z == b.z) {
        // We want to count a student that has grades equal to a query
        return a.type < b.type;
    }
    return a.z > b.z;
}
bool xsort(const Event& a, const Event& b)
{
    return a.x > b.x;
}

int N, Q;
vector<int> ycords;
vector<int> ans;
BITree b;

int yfind(int v)
{
    int pos = lower_bound(ycords.begin(), ycords.end(), v) - ycords.begin();
    return pos;
}

void add_student(int y, int v)
{
    int pos = yfind(y);
    b.add(pos, v);
}

void update_query(int y, int id)
{
    int pos = yfind(y);
    int res = b.rget(pos);

    ans[id] += res;
}

void cdq_dq(vector<Event>& events)
{
    if (events.size() <= 1) {
        return;
    }

    int mid = events.size() / 2;
    vector<Event> e1(mid), e2(events.size() - mid);

    for (int i = 0; i < mid; i++) {
        e1[i] = events[i];
    }
    for (int i = mid; i < events.size(); i++) {
        e2[i - mid] = events[i];
    }

    cdq_dq(e1);
    cdq_dq(e2);

    // Check how the STUDENTS of e1 affect the QUERIES of e2
    sort(e1.begin(), e1.end(), xsort);
    sort(e2.begin(), e2.end(), xsort);

    int curp = 0;
    for (int i = 0; i < e2.size(); i++) {
        if (e2[i].type == STUDENT) {
            continue;
        }

        while (curp < e1.size() && e1[curp].x >= e2[i].x) {
            if (e1[curp].type == STUDENT) {
                add_student(e1[curp].y, 1);
            }
            curp++;
        }

        update_query(e2[i].y, e2[i].id);
    }

    while (curp > 0) {
        if (e1[curp - 1].type == STUDENT) {
            add_student(e1[curp - 1].y, -1);
        }
        curp--;
    }
}

int main(void)
{
    scanf("%d %d", &N, &Q);
    vector<Event> initial(N + Q);
    ans.assign(Q, 0);

    for (int i = 0; i < N; i++) {
        int x, y;
        scanf("%d %d", &x, &y);

        initial[i].type = STUDENT;
        initial[i].x = x;
        initial[i].y = y;
        initial[i].z = x + y;
        initial[i].id = -1;

        ycords.pb(initial[i].y);
    }
    for (int i = 0; i < Q; i++) {
        int x, y, z;
        scanf("%d %d %d", &x, &y, &z);

        initial[i + N].type = QUERY;
        initial[i + N].x = x;
        initial[i + N].y = y;
        initial[i + N].z = z;
        initial[i + N].id = i;

        ycords.pb(initial[i + N].y);
    }

    sort(ycords.begin(), ycords.end());
    ycords.resize(unique(ycords.begin(), ycords.end()) - ycords.begin());

    b.init(ycords.size());

    sort(initial.begin(), initial.end(), sumsort);
    cdq_dq(initial);

    for (int i = 0; i < Q; i++) {
        printf("%d\n", ans[i]);
    }

    return 0;
}

Compilation message

examination.cpp: In function 'void cdq_dq(std::vector<Event>&)':
examination.cpp:99:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Event>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   99 |     for (int i = mid; i < events.size(); i++) {
      |                       ~~^~~~~~~~~~~~~~~
examination.cpp:111:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Event>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  111 |     for (int i = 0; i < e2.size(); i++) {
      |                     ~~^~~~~~~~~~~
examination.cpp:116:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Event>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  116 |         while (curp < e1.size() && e1[curp].x >= e2[i].x) {
      |                ~~~~~^~~~~~~~~~~
examination.cpp: In function 'int main()':
examination.cpp:136:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  136 |     scanf("%d %d", &N, &Q);
      |     ~~~~~^~~~~~~~~~~~~~~~~
examination.cpp:142:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  142 |         scanf("%d %d", &x, &y);
      |         ~~~~~^~~~~~~~~~~~~~~~~
examination.cpp:154:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  154 |         scanf("%d %d %d", &x, &y, &z);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
2.0 / 2.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 10 ms 860 KB Output is correct
8 Correct 10 ms 860 KB Output is correct
9 Correct 10 ms 856 KB Output is correct
10 Correct 7 ms 860 KB Output is correct
11 Correct 9 ms 856 KB Output is correct
12 Correct 5 ms 860 KB Output is correct
13 Correct 8 ms 860 KB Output is correct
14 Correct 8 ms 856 KB Output is correct
15 Correct 8 ms 860 KB Output is correct
16 Correct 6 ms 860 KB Output is correct
17 Correct 6 ms 932 KB Output is correct
18 Correct 5 ms 860 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 401 ms 16192 KB Output is correct
2 Correct 411 ms 16292 KB Output is correct
3 Correct 406 ms 16328 KB Output is correct
4 Correct 255 ms 15084 KB Output is correct
5 Correct 331 ms 15424 KB Output is correct
6 Correct 200 ms 14584 KB Output is correct
7 Correct 388 ms 16068 KB Output is correct
8 Correct 370 ms 15980 KB Output is correct
9 Correct 369 ms 16140 KB Output is correct
10 Correct 275 ms 15560 KB Output is correct
11 Correct 244 ms 15064 KB Output is correct
12 Correct 149 ms 14336 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 401 ms 16192 KB Output is correct
2 Correct 411 ms 16292 KB Output is correct
3 Correct 406 ms 16328 KB Output is correct
4 Correct 255 ms 15084 KB Output is correct
5 Correct 331 ms 15424 KB Output is correct
6 Correct 200 ms 14584 KB Output is correct
7 Correct 388 ms 16068 KB Output is correct
8 Correct 370 ms 15980 KB Output is correct
9 Correct 369 ms 16140 KB Output is correct
10 Correct 275 ms 15560 KB Output is correct
11 Correct 244 ms 15064 KB Output is correct
12 Correct 149 ms 14336 KB Output is correct
13 Correct 537 ms 16632 KB Output is correct
14 Correct 482 ms 16580 KB Output is correct
15 Correct 397 ms 16200 KB Output is correct
16 Correct 321 ms 15500 KB Output is correct
17 Correct 428 ms 15924 KB Output is correct
18 Correct 211 ms 14616 KB Output is correct
19 Correct 544 ms 16632 KB Output is correct
20 Correct 540 ms 16612 KB Output is correct
21 Correct 525 ms 16492 KB Output is correct
22 Correct 276 ms 15608 KB Output is correct
23 Correct 213 ms 15060 KB Output is correct
24 Correct 149 ms 14300 KB Output is correct

Subtask #4
57.0 / 57.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 10 ms 860 KB Output is correct
8 Correct 10 ms 860 KB Output is correct
9 Correct 10 ms 856 KB Output is correct
10 Correct 7 ms 860 KB Output is correct
11 Correct 9 ms 856 KB Output is correct
12 Correct 5 ms 860 KB Output is correct
13 Correct 8 ms 860 KB Output is correct
14 Correct 8 ms 856 KB Output is correct
15 Correct 8 ms 860 KB Output is correct
16 Correct 6 ms 860 KB Output is correct
17 Correct 6 ms 932 KB Output is correct
18 Correct 5 ms 860 KB Output is correct
19 Correct 401 ms 16192 KB Output is correct
20 Correct 411 ms 16292 KB Output is correct
21 Correct 406 ms 16328 KB Output is correct
22 Correct 255 ms 15084 KB Output is correct
23 Correct 331 ms 15424 KB Output is correct
24 Correct 200 ms 14584 KB Output is correct
25 Correct 388 ms 16068 KB Output is correct
26 Correct 370 ms 15980 KB Output is correct
27 Correct 369 ms 16140 KB Output is correct
28 Correct 275 ms 15560 KB Output is correct
29 Correct 244 ms 15064 KB Output is correct
30 Correct 149 ms 14336 KB Output is correct
31 Correct 537 ms 16632 KB Output is correct
32 Correct 482 ms 16580 KB Output is correct
33 Correct 397 ms 16200 KB Output is correct
34 Correct 321 ms 15500 KB Output is correct
35 Correct 428 ms 15924 KB Output is correct
36 Correct 211 ms 14616 KB Output is correct
37 Correct 544 ms 16632 KB Output is correct
38 Correct 540 ms 16612 KB Output is correct
39 Correct 525 ms 16492 KB Output is correct
40 Correct 276 ms 15608 KB Output is correct
41 Correct 213 ms 15060 KB Output is correct
42 Correct 149 ms 14300 KB Output is correct
43 Correct 596 ms 19028 KB Output is correct
44 Correct 598 ms 19028 KB Output is correct
45 Correct 520 ms 18980 KB Output is correct
46 Correct 313 ms 16668 KB Output is correct
47 Correct 465 ms 17536 KB Output is correct
48 Correct 224 ms 14452 KB Output is correct
49 Correct 518 ms 18972 KB Output is correct
50 Correct 567 ms 18932 KB Output is correct
51 Correct 532 ms 18780 KB Output is correct
52 Correct 403 ms 17608 KB Output is correct
53 Correct 225 ms 15812 KB Output is correct