Submission #441070

#	Time	Username	Problem	Language	Result	Execution time	Memory
441070		codebuster_10	Selling RNA Strands (JOI16_selling_rna)	C++17	100 / 100	1372 ms	783544 KiB

selling_rna

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

#define int int64_t //be careful about this 
#define endl "\n"
#define f(i,a,b) for(int i=int(a);i<int(b);++i)

#define pr pair
#define ar array
#define fr first
#define sc second
#define vt vector
#define pb push_back
#define eb emplace_back

#define SZ(x) ((int)(x).size())
#define all(a) (a).begin(),(a).end()
#define allr(a) (a).rbegin(),(a).rend()
#define mem(a,b) memset(a, b, sizeof(a))

template<class A> void rd(vt<A>& v);
template<class T> void rd(T& x){ cin >> x;}
template<class H, class... T> void rd(H& h, T&... t) { rd(h); rd(t...);}
template<class A> void rd(vt<A>& x) { for(auto& a : x) rd(a);}

template<class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0;}
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0;}

template<typename T>
void __p(T a) {
  cout<<a; 
}
template<typename T, typename F>
void __p(pair<T, F> a) {
  cout<<"{";
  __p(a.first);
  cout<<",";
  __p(a.second);
  cout<<"}\n"; 
}
template<typename T>
void __p(std::vector<T> a) {
  cout<<"{";
  for(auto it=a.begin(); it<a.end(); it++)
    __p(*it),cout<<",}\n"[it+1==a.end()]; 
}
template<typename T, typename ...Arg>
void __p(T a1, Arg ...a) {
  __p(a1);
  __p(a...);
}
template<typename Arg1>
void __f(const char *name, Arg1 &&arg1) {
  cout<<name<<" : ";
  __p(arg1);
  cout<<endl;
}
template<typename Arg1, typename ... Args>
void __f(const char *names, Arg1 &&arg1, Args &&... args) {
  int bracket=0,i=0;
  for(;; i++)
    if(names[i]==','&&bracket==0)
      break;
    else if(names[i]=='(')
      bracket++;
    else if(names[i]==')')
      bracket--;
  const char *comma=names+i;
  cout.write(names,comma-names)<<" : ";
  __p(arg1);
  cout<<" | ";
  __f(comma+1,args...);
}


void setIO(string s = "") {
  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); 
  // remove this when size of input is not fixed.
  cin.exceptions(cin.failbit); 
	cout.precision(15);	cout << fixed;
  if(SZ(s)){
  	freopen((s+".in").c_str(),"r",stdin);
  	freopen((s+".out").c_str(),"w",stdout);
  }
}


/*********************************************Look Below******************************************************************/










































template<const int ALPHABET>
struct prefix_tree {
	
	struct trie_node {
  	int link[ALPHABET];
    vector<int> who;
 
    trie_node() {
      memset(link, -1, sizeof(link));
    }
	};
	
	vector<trie_node> trie;
	
	prefix_tree(){
		trie.emplace_back();
	}
	
	void create_node(int parent, int c) {
    trie.emplace_back();
	}
	
	int get_or_create_node(int current, int c) {
    if (trie[current].link[c] < 0) {
      trie[current].link[c] = trie.size();
      create_node(current, c);
    }
 
    return trie[current].link[c];
	}
 
	int insert_str(const string & str,const int & i) {
		int current = 0;
    for(char c : str){
      current = get_or_create_node(current, c - 'A');
      trie[current].who.push_back(i);
 		}
    return current;
	}
	
	ar<int,2> query(const string & str){
		int current = 0;
		for(char c : str){
			if(trie[current].link[c-'A'] < 0) return ar<int,2>{-1,-1};
			current = trie[current].link[c-'A'];
		}
		return ar<int,2>{trie[current].who.front(),trie[current].who.back()};
	}
	
	int query(const string & str,int L,int R){
		int current = 0;
		for(char c : str){
			if(trie[current].link[c-'A'] < 0) return int(0);
			current = trie[current].link[c-'A'];
		}
		return int(upper_bound(all(trie[current].who),R) - lower_bound(all(trie[current].who),L));
	}
};

prefix_tree<26> trie, reverse_trie;

signed main(){
  setIO();
	int n,q; 
	rd(n,q);
	vt<string> s(n);
	rd(s);
	sort(all(s));
	
	f(i,0,n){
		trie.insert_str(s[i],i);
		reverse(all(s[i]));
		reverse_trie.insert_str(s[i],i);
	}
	
	while(q--){
		string p,q;
		rd(p,q);
		auto [L,R] = trie.query(p);
		reverse(all(q));
		cout << reverse_trie.query(q,L,R) << endl;
	}
	
}

Compilation message (stderr)

selling_rna.cpp: In function 'void setIO(std::string)':
selling_rna.cpp:82:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |    freopen((s+".in").c_str(),"r",stdin);
      |    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
selling_rna.cpp:83:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |    freopen((s+".out").c_str(),"w",stdout);
      |    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 25 / 25
• Subtask 3: 25 / 25
• Subtask 4: 40 / 40