Submission #346800

#	Time	Username	Problem	Language	Result	Execution time	Memory
346800		arnold518	Trampoline (info1cup20_trampoline)	C++14	100 / 100	788 ms	55476 KiB

trampoline

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 2e5;

int R, C, N, Q;
pii A[MAXN+10];
unordered_map<int, vector<pii>> M;
int par[MAXN+10][30];

int main()
{
	scanf("%d%d%d", &R, &C, &N);
	for(int i=1; i<=N; i++)
	{
		scanf("%d%d", &A[i].first, &A[i].second);
		M[A[i].first].push_back({A[i].second, i});
	}

	for(auto &it : M)
	{
		sort(it.second.begin(), it.second.end());
	}

	for(int i=1; i<=N; i++)
	{
		if(M.find(A[i].first+1)==M.end()) continue;
		auto it=lower_bound(M[A[i].first+1].begin(), M[A[i].first+1].end(), pii(A[i].second, 0));
		if(it==M[A[i].first+1].end()) par[i][0]=0;
		else par[i][0]=it->second;
		if(par[i][0]!=0) assert(A[par[i][0]].first==A[i].first+1);
	}

	A[0]={2e9, 2e9};
	for(int i=1; i<=20; i++) for(int j=1; j<=N; j++) par[j][i]=par[par[j][i-1]][i-1];

	scanf("%d", &Q);
	while(Q--)
	{
		int y1, x1, y2, x2;
		scanf("%d%d%d%d", &y1, &x1, &y2, &x2);
		if(x1>x2 || y1>y2)
		{
			printf("No\n");
			continue;
		}
		if(y1==y2 && x1<=x2)
		{
			printf("Yes\n");
			continue;
		}

		if(M.find(y1)==M.end())
		{
			printf("No\n");
			continue;
		}
		auto it=lower_bound(M[y1].begin(), M[y1].end(), pii(x1, 0));
		if(it==M[y1].end())
		{
			printf("No\n");
			continue;
		}
		int now=it->second;
		/*
		while(1)
		{
			if(A[par[now][0]].first>=y2) break;
			now=par[now][0];
		}
		*/

		for(int i=20; i>=0; i--)
		{
			if(A[par[now][i]].first<y2) now=par[now][i];
		}
		

		if(A[now].first!=y2-1)
		{
			printf("No\n");
			continue;
		}

		if(A[now].second<=x2)
		{
			printf("Yes\n");
		}
		else
		{
			printf("No\n");
		}
	}
}

Compilation message (stderr)

trampoline.cpp: In function 'int main()':
trampoline.cpp:17:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   17 |  scanf("%d%d%d", &R, &C, &N);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~
trampoline.cpp:20:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   20 |   scanf("%d%d", &A[i].first, &A[i].second);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
trampoline.cpp:41:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   41 |  scanf("%d", &Q);
      |  ~~~~~^~~~~~~~~~
trampoline.cpp:45:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   45 |   scanf("%d%d%d%d", &y1, &x1, &y2, &x2);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 23 / 23
• Subtask 2: 20 / 20
• Subtask 3: 11 / 11
• Subtask 4: 19 / 19
• Subtask 5: 27 / 27