Submission #1029264

#	Time	Username	Problem	Language	Result	Execution time	Memory
1029264		berr	Trampoline (info1cup20_trampoline)	C++17	100 / 100	253 ms	56920 KiB

trampoline

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

void f(){
	#ifndef ONLINE_JUDGE
	freopen("in.txt", "r", stdin);
	freopen("out.txt", "w", stdout);
	#endif
}

signed main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);

//	f();

	int n, m, t; cin >> n >> m >> t;
	vector<array<int, 2>> tram(t);
	vector<array<int, 25>> p(t+1);

	for(auto &[i, l]: tram) cin >> i >> l;

	sort(tram.begin(), tram.end());
	vector<array<int, 2>> ol;
	int pos=-1;
	for(int i=t-1; i>=0; i--){

		auto [r, c]=tram[i];

		if(i<t-1&&tram[i+1][0]!=r){
			ol.clear();
			for(int j=i+1; j<t; j++){
				if(tram[j][0]==r+1){
					ol.push_back({tram[j][1], j});
				}
				else break;
			}

			pos=ol.size()-1;
		} 

		while(pos>0&&ol[pos-1][0]>=c) pos--;
		
		if(pos<0||ol[pos][0]<c){

			p[i][0]=i;
		}
		else{
			p[i][0]=ol[pos][1];
		}
	}

	for(int l=1; l<25; l++){
		for(int i=0; i<t; i++){
			p[i][l]=p[p[i][l-1]][l-1];
		}
	}

	int q; cin >> q;
	while(q--){ 
		int x, y; cin >> x >> y;
		int pos=lower_bound(tram.begin(), tram.end(), (array<int, 2>){x, y})-tram.begin();
		int ex, ey; cin >> ex >> ey;

		if(ex==x){
			if(y<=ey) cout<<"Yes";
			else cout<<"No";
		}
		else if(ex<x){
			cout<<"No";
		}
		else if(tram.size()==pos) cout<<"No";
		else if(tram[pos][0]!=x) cout<<"No";
		else{
			int dif=ex-x-1;
			for(int j=24; j>=0; j--){
				if((1<<j)<=dif){
					pos=p[pos][j];
					dif-=(1<<j);
				}
			}

			if(tram[pos][0]==ex-1&&tram[pos][1]<=ey){
				cout<<"Yes";
			}
			else cout<<"No";

		}

		cout<<"\n";
	}
}

Compilation message (stderr)

trampoline.cpp: In function 'int main()':
trampoline.cpp:73:22: warning: comparison of integer expressions of different signedness: 'std::vector<std::array<long long int, 2> >::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   73 |   else if(tram.size()==pos) cout<<"No";
      |           ~~~~~~~~~~~^~~~~
trampoline.cpp: In function 'void f()':
trampoline.cpp:7:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 |  freopen("in.txt", "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
trampoline.cpp:8:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |  freopen("out.txt", "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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