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답안 #373293

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
373293 2021-03-04T02:52:41 Z morato Examination (JOI19_examination) C++17
100 / 100
 474 ms 133464 KB 
#include <bits/stdc++.h>
using namespace std;

const int N = 1e5 + 5;
const int S = 320;

struct BIT 
{
	int bit[S][N];

	void update(int x, int y) {
		for (int i = x; i > 0; i -= i & -i) {
			for (int j = y; j > 0; j -= j & -j) {
				bit[i][j]++;
			}
		}
	}

	int query(int x, int y) {
		int ret = 0;
		for (int i = x; i < S; i += i & -i) {
			for (int j = y; j < N; j += j & -j) {
				ret += bit[i][j];
			}
		}
		return ret;
	}
} bit;

struct Query
{
	int x, y, z, id;
	Query() {}
	Query(int _x, int _y, int _z, int _id): x(_x), y(_y), z(_z), id(_id) {}
	bool operator<(Query other) {
		return z > other.z;
	}
} q[N];

struct Aluno 
{
	int a, b, soma;
	Aluno() {}
	Aluno(int _a, int _b): a(_a), b(_b), soma(_a + _b) {}
	bool operator<(Aluno other) {
		return soma > other.soma;
	}
} a[N];

vector<pair<int, int>> cmp[2];
vector<Aluno> bloco[S];
int ans[N];

int main() {
	int n, m;
	scanf("%d %d", &n, &m);
	for (int i = 0; i < n; i++) {
		int s, t;
		scanf("%d %d", &s, &t);
		a[i] = Aluno(s, t);
		cmp[0].emplace_back(s, i);
		cmp[1].emplace_back(t, i);
	}
	// comprime s e t
	for (int i : {0, 1}) {
		sort(cmp[i].begin(), cmp[i].end());
	}
	// conserta os ranges das queries
	for (int i = 0; i < m; i++) {
		int x, y, z;
		cin >> x >> y >> z;
		auto it = lower_bound(cmp[0].begin(), cmp[0].end(), make_pair(x, -1));
		x = (int) (it - cmp[0].begin()) + 1;
		it = lower_bound(cmp[1].begin(), cmp[1].end(), make_pair(y, -1));
		y = (int) (it - cmp[1].begin()) + 1;
		q[i] = Query(x, y, z, i);
	}
	// comprime de verdade
	for (int i = 0; i < (int) cmp[0].size(); i++) {
		a[cmp[0][i].second].a = i + 1;
	}
	for (int i = 0; i < (int) cmp[1].size(); i++) {
		a[cmp[1][i].second].b = i + 1;
	}
	// ordeno os alunos pela soma pra sempre pegar um prefixo do array
	sort(a, a + n);
	sort(q, q + n);
	int ptr = 0;
	for (int i = 0; i < m; i++) {
		for (; ptr < n && a[ptr].soma >= q[i].z; ptr++) {
			bit.update(a[ptr].a / S, a[ptr].b); // bloco do a, valor do b
			bloco[a[ptr].a / S].push_back(a[ptr]);
		}
		// com certeza todos os "eventos" com soma >= q[i].z ja foram processados
		// faz uma query de sufixo nos blocos de A > q[i].x e nos valores de B >= q[i].y
		ans[q[i].id] = bit.query(q[i].x / S + 1, q[i].y);
		for (auto cara : bloco[q[i].x / S]) {
			ans[q[i].id] += (cara.a >= q[i].x && cara.b >= q[i].y);
		}
	}
	for (int i = 0; i < m; i++) {
		printf("%d\n", ans[i]);
	}
}

Compilation message

examination.cpp: In function 'int main()':
examination.cpp:56:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   56 |  scanf("%d %d", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~~
examination.cpp:59:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   59 |   scanf("%d %d", &s, &t);
      |   ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
2.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 8 ms 748 KB Output is correct
8 Correct 9 ms 876 KB Output is correct
9 Correct 9 ms 876 KB Output is correct
10 Correct 7 ms 876 KB Output is correct
11 Correct 7 ms 876 KB Output is correct
12 Correct 6 ms 940 KB Output is correct
13 Correct 8 ms 920 KB Output is correct
14 Correct 11 ms 876 KB Output is correct
15 Correct 9 ms 924 KB Output is correct
16 Correct 7 ms 876 KB Output is correct
17 Correct 9 ms 992 KB Output is correct
18 Correct 4 ms 748 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 365 ms 129388 KB Output is correct
2 Correct 367 ms 132032 KB Output is correct
3 Correct 366 ms 131956 KB Output is correct
4 Correct 314 ms 131096 KB Output is correct
5 Correct 337 ms 131288 KB Output is correct
6 Correct 218 ms 60888 KB Output is correct
7 Correct 337 ms 131800 KB Output is correct
8 Correct 349 ms 131800 KB Output is correct
9 Correct 302 ms 131812 KB Output is correct
10 Correct 288 ms 131288 KB Output is correct
11 Correct 319 ms 130808 KB Output is correct
12 Correct 138 ms 14424 KB Output is correct

Subtask #3
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 365 ms 129388 KB Output is correct
2 Correct 367 ms 132032 KB Output is correct
3 Correct 366 ms 131956 KB Output is correct
4 Correct 314 ms 131096 KB Output is correct
5 Correct 337 ms 131288 KB Output is correct
6 Correct 218 ms 60888 KB Output is correct
7 Correct 337 ms 131800 KB Output is correct
8 Correct 349 ms 131800 KB Output is correct
9 Correct 302 ms 131812 KB Output is correct
10 Correct 288 ms 131288 KB Output is correct
11 Correct 319 ms 130808 KB Output is correct
12 Correct 138 ms 14424 KB Output is correct
13 Correct 412 ms 132288 KB Output is correct
14 Correct 390 ms 132184 KB Output is correct
15 Correct 351 ms 132100 KB Output is correct
16 Correct 319 ms 131420 KB Output is correct
17 Correct 327 ms 131672 KB Output is correct
18 Correct 209 ms 61144 KB Output is correct
19 Correct 384 ms 132312 KB Output is correct
20 Correct 400 ms 132372 KB Output is correct
21 Correct 337 ms 132316 KB Output is correct
22 Correct 282 ms 131084 KB Output is correct
23 Correct 287 ms 130776 KB Output is correct
24 Correct 142 ms 14424 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 8 ms 748 KB Output is correct
8 Correct 9 ms 876 KB Output is correct
9 Correct 9 ms 876 KB Output is correct
10 Correct 7 ms 876 KB Output is correct
11 Correct 7 ms 876 KB Output is correct
12 Correct 6 ms 940 KB Output is correct
13 Correct 8 ms 920 KB Output is correct
14 Correct 11 ms 876 KB Output is correct
15 Correct 9 ms 924 KB Output is correct
16 Correct 7 ms 876 KB Output is correct
17 Correct 9 ms 992 KB Output is correct
18 Correct 4 ms 748 KB Output is correct
19 Correct 365 ms 129388 KB Output is correct
20 Correct 367 ms 132032 KB Output is correct
21 Correct 366 ms 131956 KB Output is correct
22 Correct 314 ms 131096 KB Output is correct
23 Correct 337 ms 131288 KB Output is correct
24 Correct 218 ms 60888 KB Output is correct
25 Correct 337 ms 131800 KB Output is correct
26 Correct 349 ms 131800 KB Output is correct
27 Correct 302 ms 131812 KB Output is correct
28 Correct 288 ms 131288 KB Output is correct
29 Correct 319 ms 130808 KB Output is correct
30 Correct 138 ms 14424 KB Output is correct
31 Correct 412 ms 132288 KB Output is correct
32 Correct 390 ms 132184 KB Output is correct
33 Correct 351 ms 132100 KB Output is correct
34 Correct 319 ms 131420 KB Output is correct
35 Correct 327 ms 131672 KB Output is correct
36 Correct 209 ms 61144 KB Output is correct
37 Correct 384 ms 132312 KB Output is correct
38 Correct 400 ms 132372 KB Output is correct
39 Correct 337 ms 132316 KB Output is correct
40 Correct 282 ms 131084 KB Output is correct
41 Correct 287 ms 130776 KB Output is correct
42 Correct 142 ms 14424 KB Output is correct
43 Correct 429 ms 133336 KB Output is correct
44 Correct 439 ms 133356 KB Output is correct
45 Correct 449 ms 133360 KB Output is correct
46 Correct 359 ms 132604 KB Output is correct
47 Correct 363 ms 132876 KB Output is correct
48 Correct 213 ms 60880 KB Output is correct
49 Correct 474 ms 133464 KB Output is correct
50 Correct 382 ms 133352 KB Output is correct
51 Correct 363 ms 133436 KB Output is correct
52 Correct 322 ms 132736 KB Output is correct
53 Correct 296 ms 131648 KB Output is correct