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답안 #879146

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
879146 2023-11-26T12:58:12 Z nonono Swap (BOI16_swap) C++17
100 / 100
 623 ms 233960 KB 
#include <bits/stdc++.h>
using namespace std;

int a[200002];
bool needed[200002][18][2];
vector<int> dp[200002][18][2], tmp1, tmp2;

void merge(vector<int> &ret, vector<int> &l, vector<int> &r) {
	for (int i = 0, j = 1; i < l.size(); i += j, j <<= 1) {
		for (int k = i; k < i + j && k < l.size(); k++) ret.push_back(l[k]);
		for (int k = i; k < i + j && k < r.size(); k++) ret.push_back(r[k]);
	}
}

int main() {
	int n;
	scanf("%d", &n);
	for (int i = 1; i <= n; i++) scanf("%d", a + i);

	needed[1][0][1] = 1;
	for (int node = 1; node <= n / 2; node++) {
		for (int i = 0; node >> i; i++)
			for (int j : {0, 1}) {
				if (!needed[node][i][j]) continue;

				int mn = min({a[((node >> i + 1) << 1) + j], a[2 * node],
				              a[2 * node + 1]});
				if (mn == a[((node >> i + 1) << 1) + j]) {
					needed[2 * node][0][0] = needed[2 * node + 1][0][1] = 1;
				} else if (mn == a[2 * node]) {
					needed[2 * node][i + 1][j] = needed[2 * node + 1][0][1] = 1;
				} else {
					needed[2 * node][0][0] = needed[2 * node][i + 1][j] = 1;
					needed[2 * node + 1][0][0] =
					    needed[2 * node + 1][i + 1][j] = 1;
				}
			}
	}

	for (int node = n; node; node--) {
		for (int i = 0; node >> i; i++)
			for (int j : {0, 1}) {
				if (!needed[node][i][j]) continue;

				int p = ((node >> i + 1) << 1) + j;
				if (2 * node > n) dp[node][i][j] = {a[p]};
				else if (2 * node == n) {
					dp[node][i][j] = {min(a[p], a[2 * node]),
					                  max(a[p], a[2 * node])};
				} else {
					if (a[2 * node + 1] < min(a[p], a[2 * node])) {
						tmp1 = tmp2 = {a[2 * node + 1]};
						merge(tmp1, dp[2 * node][0][0],
						      dp[2 * node + 1][i + 1][j]);
						merge(tmp2, dp[2 * node][i + 1][j],
						      dp[2 * node + 1][0][0]);
						dp[node][i][j] = min(tmp1, tmp2);
					} else {
						dp[node][i][j] = {min(a[p], a[2 * node])};
						if (a[p] < a[2 * node]) {
							merge(dp[node][i][j], dp[2 * node][0][0],
							      dp[2 * node + 1][0][1]);
						} else {
							merge(dp[node][i][j], dp[2 * node][i + 1][j],
							      dp[2 * node + 1][0][1]);
						}
					}
				}
			}
		if (2 * node < n) {
			for (int i = 0; 2 * node >> i; i++)
				for (int j : {0, 1}) {
					vector<int>().swap(dp[2 * node][i][j]);
					vector<int>().swap(dp[2 * node + 1][i][j]);
				}
		}
	}

	for (int i : dp[1][0][1]) printf("%d ", i);
	return 0;
}

Compilation message

swap.cpp: In function 'void merge(std::vector<int>&, std::vector<int>&, std::vector<int>&)':
swap.cpp:9:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |  for (int i = 0, j = 1; i < l.size(); i += j, j <<= 1) {
      |                         ~~^~~~~~~~~~
swap.cpp:10:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |   for (int k = i; k < i + j && k < l.size(); k++) ret.push_back(l[k]);
      |                                ~~^~~~~~~~~~
swap.cpp:11:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |   for (int k = i; k < i + j && k < r.size(); k++) ret.push_back(r[k]);
      |                                ~~^~~~~~~~~~
swap.cpp: In function 'int main()':
swap.cpp:26:33: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   26 |     int mn = min({a[((node >> i + 1) << 1) + j], a[2 * node],
      |                               ~~^~~
swap.cpp:28:29: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   28 |     if (mn == a[((node >> i + 1) << 1) + j]) {
      |                           ~~^~~
swap.cpp:45:25: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   45 |     int p = ((node >> i + 1) << 1) + j;
      |                       ~~^~~
swap.cpp:17:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~
swap.cpp:18:36: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |  for (int i = 1; i <= n; i++) scanf("%d", a + i);
      |                               ~~~~~^~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 75 ms 172820 KB Output is correct
2 Correct 45 ms 172884 KB Output is correct
3 Correct 39 ms 172884 KB Output is correct
4 Correct 39 ms 172792 KB Output is correct
5 Correct 46 ms 172932 KB Output is correct

Subtask #2
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 75 ms 172820 KB Output is correct
2 Correct 45 ms 172884 KB Output is correct
3 Correct 39 ms 172884 KB Output is correct
4 Correct 39 ms 172792 KB Output is correct
5 Correct 46 ms 172932 KB Output is correct
6 Correct 38 ms 172892 KB Output is correct
7 Correct 40 ms 172988 KB Output is correct
8 Correct 38 ms 172896 KB Output is correct
9 Correct 38 ms 172976 KB Output is correct
10 Correct 43 ms 172952 KB Output is correct

Subtask #3
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 75 ms 172820 KB Output is correct
2 Correct 45 ms 172884 KB Output is correct
3 Correct 39 ms 172884 KB Output is correct
4 Correct 39 ms 172792 KB Output is correct
5 Correct 46 ms 172932 KB Output is correct
6 Correct 38 ms 172892 KB Output is correct
7 Correct 40 ms 172988 KB Output is correct
8 Correct 38 ms 172896 KB Output is correct
9 Correct 38 ms 172976 KB Output is correct
10 Correct 43 ms 172952 KB Output is correct
11 Correct 38 ms 173020 KB Output is correct
12 Correct 39 ms 172884 KB Output is correct
13 Correct 38 ms 172884 KB Output is correct
14 Correct 42 ms 172960 KB Output is correct
15 Correct 43 ms 173148 KB Output is correct

Subtask #4
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 75 ms 172820 KB Output is correct
2 Correct 45 ms 172884 KB Output is correct
3 Correct 39 ms 172884 KB Output is correct
4 Correct 39 ms 172792 KB Output is correct
5 Correct 46 ms 172932 KB Output is correct
6 Correct 38 ms 172892 KB Output is correct
7 Correct 40 ms 172988 KB Output is correct
8 Correct 38 ms 172896 KB Output is correct
9 Correct 38 ms 172976 KB Output is correct
10 Correct 43 ms 172952 KB Output is correct
11 Correct 38 ms 173020 KB Output is correct
12 Correct 39 ms 172884 KB Output is correct
13 Correct 38 ms 172884 KB Output is correct
14 Correct 42 ms 172960 KB Output is correct
15 Correct 43 ms 173148 KB Output is correct
16 Correct 79 ms 177512 KB Output is correct
17 Correct 78 ms 177616 KB Output is correct
18 Correct 80 ms 177964 KB Output is correct
19 Correct 151 ms 187460 KB Output is correct
20 Correct 139 ms 187360 KB Output is correct

Subtask #5
32.0 / 32.0

# 결과 실행 시간 메모리 Grader output
1 Correct 75 ms 172820 KB Output is correct
2 Correct 45 ms 172884 KB Output is correct
3 Correct 39 ms 172884 KB Output is correct
4 Correct 39 ms 172792 KB Output is correct
5 Correct 46 ms 172932 KB Output is correct
6 Correct 38 ms 172892 KB Output is correct
7 Correct 40 ms 172988 KB Output is correct
8 Correct 38 ms 172896 KB Output is correct
9 Correct 38 ms 172976 KB Output is correct
10 Correct 43 ms 172952 KB Output is correct
11 Correct 38 ms 173020 KB Output is correct
12 Correct 39 ms 172884 KB Output is correct
13 Correct 38 ms 172884 KB Output is correct
14 Correct 42 ms 172960 KB Output is correct
15 Correct 43 ms 173148 KB Output is correct
16 Correct 79 ms 177512 KB Output is correct
17 Correct 78 ms 177616 KB Output is correct
18 Correct 80 ms 177964 KB Output is correct
19 Correct 151 ms 187460 KB Output is correct
20 Correct 139 ms 187360 KB Output is correct
21 Correct 232 ms 188244 KB Output is correct
22 Correct 224 ms 188244 KB Output is correct
23 Correct 228 ms 187596 KB Output is correct
24 Correct 623 ms 233648 KB Output is correct
25 Correct 568 ms 233960 KB Output is correct