제출 #432187

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
432187		jamezzz	Long Mansion (JOI17_long_mansion)	C++17	100 / 100	506 ms	41412 KiB

long_mansion

#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 INF 1023456789
#define LINF 1023456789123456789
#define all(x) x.begin(), x.end()
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
typedef tuple<int, int, int> iii;
typedef tuple<int, int, int, int> iiii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<pll> vll;
mt19937 rng(time(0));

#define maxn 500005

int n,c[maxn],b,t,q,x,y,cl[maxn],cr[maxn],l[maxn],r[maxn];
vi v[maxn];

bool can(int x,int l,int r){
	//current range is [l,r], can u travel through door x
	int pos=lower_bound(all(v[c[x]]),l)-v[c[x]].begin();
	if(pos==sz(v[c[x]])||v[c[x]][pos]>r)return false;
	return true;
}

ii thing(int l,int r){
	if(l>1&&can(l-1,l,r))return thing(cl[l-1],r);
	if(r<n&&can(r,l,r))return thing(l,cr[r+1]);
	return ii(l,r);
}

int main(){
	sf("%d",&n);
	for(int i=1;i<n;++i)sf("%d",&c[i]);
	for(int i=1;i<=n;++i){
		sf("%d",&b);
		for(int j=0;j<b;++j){
			sf("%d",&t);
			v[t].pb(i);
		}
	}
	for(int i=1;i<=n;++i){
		cl[i]=i;
		while(1<cl[i]&&can(cl[i]-1,cl[i],i))cl[i]=cl[cl[i]-1];
	}
	for(int i=n;i>=1;--i){
		cr[i]=i;
		while(cr[i]<n&&can(cr[i],i,cr[i]))cr[i]=cr[cr[i]+1];
	}
	for(int i=1;i<=n;++i){
		if(i>1&&can(i-1,i,cr[i])){
			l[i]=l[i-1];
			r[i]=max(r[i-1],cr[i]);
		}
		else{
			l[i]=cl[i];r[i]=cr[i];
		}
		tie(l[i],r[i])=thing(l[i],r[i]);
	}
	sf("%d",&q);
	while(q--){
		sf("%d%d",&x,&y);
		if(l[x]<=y&&y<=r[x])pf("YES\n");
		else pf("NO\n");
	}
}

컴파일 시 표준 에러 (stderr) 메시지

long_mansion.cpp: In function 'int main()':
long_mansion.cpp:43:4: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |  sf("%d",&n);
      |    ^
long_mansion.cpp:44:24: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |  for(int i=1;i<n;++i)sf("%d",&c[i]);
      |                        ^
long_mansion.cpp:46:5: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |   sf("%d",&b);
      |     ^
long_mansion.cpp:48:6: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |    sf("%d",&t);
      |      ^
long_mansion.cpp:70:4: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |  sf("%d",&q);
      |    ^
long_mansion.cpp:72:5: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |   sf("%d%d",&x,&y);
      |     ^

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 15 / 15
• Subtask 4: 75 / 75