Submission #143510

#	Time	Username	Problem	Language	Result	Execution time	Memory
143510		kig9981	버스 (JOI14_bus)	C++17	100 / 100	514 ms	35832 KiB

bus

#include <bits/stdc++.h>

#ifdef NON_SUBMIT
#define TEST(n) (n)
#define tout cerr
#else
#define TEST(n) ((void)0)
#define tout cin
#endif

using namespace std;

vector<tuple<int,int,int>> adj[100000];
vector<int> D[100000], x[100000];

int solve(int c, int t)
{
	if(c==0) return x[c][t];
	if(D[c][t]!=0x7fffffff) return D[c][t];
	if(t) D[c][t]=solve(c,t-1);
	else D[c][t]=-1;
	for(int i=lower_bound(adj[c].begin(),adj[c].end(),make_tuple(x[c][t],-1,-1))-adj[c].begin();i<adj[c].size() && get<0>(adj[c][i])==x[c][t];i++) {
		int tmp, n, v;
		tie(tmp,n,v)=adj[c][i];
		v=lower_bound(x[n].begin(),x[n].end(),v)-x[n].begin();
		D[c][t]=max(D[c][t],solve(n,v));
	}
	return D[c][t];
}

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(NULL); cout.tie(NULL);
	TEST(freopen("input.txt", "r", stdin));
	TEST(freopen("output.txt", "w", stdout));
	TEST(freopen("debug.txt", "w", stderr));
	int N, M;
	for(cin>>N>>M;M--;) {
		int A, B, X, Y;
		cin>>A>>B>>X>>Y;
		adj[--B].emplace_back(Y,--A,X);
		x[A].push_back(X);
		x[B].push_back(Y);
	}
	for(int i=0;i<N;i++) {
		sort(adj[i].begin(),adj[i].end());
		sort(x[i].begin(),x[i].end());
		x[i].resize(unique(x[i].begin(),x[i].end())-x[i].begin());
		D[i].resize(x[i].size(),0x7fffffff);
	}
	for(int i=0;i<x[N-1].size();i++) solve(N-1,i);
	for(cin>>M;M--;) {
		int L;
		cin>>L;
		L=upper_bound(x[N-1].begin(),x[N-1].end(),L)-x[N-1].begin()-1;
		if(L==-1 || D[N-1][L]==-1) cout<<"-1\n";
		else cout<<D[N-1][L]<<'\n';
	}
	return 0;
}

Compilation message (stderr)

bus.cpp: In function 'int solve(int, int)':
bus.cpp:22:95: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=lower_bound(adj[c].begin(),adj[c].end(),make_tuple(x[c][t],-1,-1))-adj[c].begin();i<adj[c].size() && get<0>(adj[c][i])==x[c][t];i++) {
                                                                                              ~^~~~~~~~~~~~~~
bus.cpp: In function 'int main()':
bus.cpp:52:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<x[N-1].size();i++) solve(N-1,i);
              ~^~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 15 / 15
• Subtask 3: 15 / 15
• Subtask 4: 50 / 50