Submission #109690

#	Time	Username	Problem	Language	Result	Execution time	Memory
109690		njchung99	Matryoshka (JOI16_matryoshka)	C++14	26 / 100	3 ms	432 KiB

matryoshka

#include<cstdio>
#include<cstring>
#include<vector>
#include<algorithm>
using namespace std;
vector<vector<int>> vt;
int dap = 0;
int q, w;
pair<int, int> a[2010];
int visited[2010];
int indegree[2010];
void dfs(int here) {
	visited[here] = 1;
	int update = 0;
	for (int i = 0; i < vt[here].size(); i++) {
		int next = vt[here][i];
		if (a[next].first >= q && a[next].second <= w&&!visited[next]&&indegree[next]==1) {
			dfs(next);
			update = 1;
			break;
		}
	}
	if (!update) {
		for (int i = 0; i < vt[here].size(); i++) {
			int next = vt[here][i];
			if (a[next].first >= q && a[next].second <= w && !visited[next]) {
				dfs(next);
				break;
			}
		}
	}
	for (int i = 0; i < vt[here].size(); i++) {
		int next = vt[here][i];
		if (a[next].first >= q && a[next].second <= w && !visited[next]) {
			indegree[next]--;
		}
	}
}
int main()
{
	int n,m;
	scanf("%d %d", &n,&m);
	vt.resize(n + 1);
	for (int i = 0; i < n; i++) {
		scanf("%d %d", &a[i].first, &a[i].second);
	}
	sort(a, a + n);
	reverse(a, a + n);
	for (int i = 0; i < n; i++) {
		for (int y = 0; y < n; y++)
		{
			if (a[i].first > a[y].first&&a[i].second > a[y].second) {
				vt[i].push_back(y);
				indegree[y]++;
			}
		}
	}
	while(m--){
		scanf("%d %d", &q, &w);
		memset(visited, 0, sizeof(visited));
		int oo = 0;
		for (int i = 0; i < n; i++) {
			if (a[i].first >= q && a[i].second <= w&&!visited[i]) {
				dfs(i);
				oo++;
			}
		}
		printf("%d\n", oo);
	}
}

Compilation message (stderr)

matryoshka.cpp: In function 'void dfs(int)':
matryoshka.cpp:15:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < vt[here].size(); i++) {
                  ~~^~~~~~~~~~~~~~~~~
matryoshka.cpp:24:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i = 0; i < vt[here].size(); i++) {
                   ~~^~~~~~~~~~~~~~~~~
matryoshka.cpp:32:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < vt[here].size(); i++) {
                  ~~^~~~~~~~~~~~~~~~~
matryoshka.cpp: In function 'int main()':
matryoshka.cpp:42:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n,&m);
  ~~~~~^~~~~~~~~~~~~~~~
matryoshka.cpp:45:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &a[i].first, &a[i].second);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
matryoshka.cpp:59:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &q, &w);
   ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 15 / 15
• Subtask 3: 0 / 25
• Subtask 4: 0 / 49