Submission #426954

#	Time	Username	Problem	Language	Result	Execution time	Memory
426954		jamezzz	Trampoline (info1cup20_trampoline)	C++17	11 / 100	378 ms	20444 KiB

trampoline

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

#define sf scanf
#define pf printf
#define fi first
#define se second
#define pb emplace_back
#define sz(x) (int)x.size()
#define all(x) x.begin(),x.end()
typedef pair<int,int> ii;

int r,c,n,t,a,b,xa,xb,ya,yb,nx[200005][20];
vector<ii> v,v1,v2;

int main(){
	sf("%d%d%d",&r,&c,&n);
	for(int i=0;i<n;++i){
		sf("%d%d",&a,&b);
		v.pb(a,b);
	}
	sort(all(v));int pv=-1;
	for(int i=0;i<n;++i)nx[i][0]=-1;
	for(int i=0;i<n;++i){
		v2.pb(v[i].se,i);
		if(i==n-1||v[i].fi!=v[i+1].fi){
			if(v[i].fi==pv+1){
				int cur=0;
				for(int j=0;j<sz(v2);++j){
					while(cur<sz(v1)&&v1[cur].fi<v2[j].fi)++cur;
					if(cur!=0)nx[v1[cur-1].se][0]=v2[j].se;
				}
			}
			v1.clear();
			swap(v1,v2);
			pv=v[i].fi;
		}
	}
	/*
	for(int i=0;i<n;++i){
		pf("%d %d: %d\n",v[i].fi,v[i].se,nx[i][0]);
	}
	//*/
	for(int k=1;k<20;++k){
		for(int i=0;i<n;++i){
			if(nx[i][k-1]!=-1)nx[i][k]=nx[nx[i][k-1]][k-1];
			else nx[i][k]=-1;
		}
	}
	sf("%d",&t);
	for(int i=0;i<t;++i){
		sf("%d%d%d%d",&xa,&ya,&xb,&yb);
		if(xb<xa||yb<ya){
			pf("No\n");continue;
		}
		if(xa==xb){
			pf("Yes\n");continue;
		}
		int x=lower_bound(all(v),ii(xa,ya))-v.begin();
		if(x==sz(v)||v[x].fi!=xa){
			pf("No\n");continue;
		}
		int cur=x;
		for(int k=19;k>=0;--k){
			if(nx[cur][k]!=-1&&v[nx[cur][k]].fi<=xb-1)cur=nx[cur][k];
		}
		if(v[cur].fi<xb-1||v[cur].se>yb)pf("No\n");
		else pf("Yes\n");
	}
}

Compilation message (stderr)

trampoline.cpp: In function 'int main()':
trampoline.cpp:17:4: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |  sf("%d%d%d",&r,&c,&n);
      |    ^
trampoline.cpp:19:5: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |   sf("%d%d",&a,&b);
      |     ^
trampoline.cpp:50:4: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |  sf("%d",&t);
      |    ^
trampoline.cpp:52:5: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |   sf("%d%d%d%d",&xa,&ya,&xb,&yb);
      |     ^

• Subtask 1: 0 / 23
• Subtask 2: 0 / 20
• Subtask 3: 11 / 11
• Subtask 4: 0 / 19
• Subtask 5: 0 / 27