Submission #788698

#	Time	Username	Problem	Language	Result	Execution time	Memory
788698		Dan4Life	Selling RNA Strands (JOI16_selling_rna)	C++17	100 / 100	343 ms	205308 KiB

selling_rna

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define all(a) begin(a),end(a)
const int mxN = (int)1e5+10;
const int mxS = (int)2e6+10;
vector<int> xd[mxS];
int trie[2][4][mxS];
int L[mxS], R[mxS];
int n, m, node[2];
string s[mxS];

void add(string &s, int ind, int t){
	int v = 1;
	for(auto u : s){
		int c = (u=='A'?0:u=='C'?1:u=='G'?2:3);
		if(!trie[t][c][v]) trie[t][c][v]=node[t]++;
		v = trie[t][c][v];
		if(!t){
			if(!L[v]) L[v]=ind;
			R[v]=max(R[v],ind);
		}
		else xd[v].pb(ind);
	}
}

int get(string &s, int t){
	int v = 1;
	for(auto u : s){
		int c = (u=='A'?0:u=='C'?1:u=='G'?2:3);
		v = trie[t][c][v]; if(!v) return 0;
	}
	return v;
}

int32_t main()
{
	cin >> n >> m; node[0]=node[1]=2;
	for(int i = 0; i < n; i++) cin >> s[i]; sort(s,s+n);
	for(int i = 0; i < n; i++)
		add(s[i],i+1,0),reverse(all(s[i])),add(s[i],i+1,1);
	for(int i = 0; i < m; i++){
		string s, t; cin >> s >> t; reverse(all(t));
		int ind = get(s,0), ind2=get(t,1);
		int l = L[ind], r=R[ind];
		if(!l or !ind or !ind2) { cout << "0\n"; continue; }
		int pos1 = lower_bound(all(xd[ind2]),l)-begin(xd[ind2]);
		int pos2 = upper_bound(all(xd[ind2]),r)-begin(xd[ind2]);
		cout << max(0, pos2-pos1) << "\n";
	}
}

Compilation message (stderr)

selling_rna.cpp: In function 'int32_t main()':
selling_rna.cpp:39:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   39 |  for(int i = 0; i < n; i++) cin >> s[i]; sort(s,s+n);
      |  ^~~
selling_rna.cpp:39:42: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   39 |  for(int i = 0; i < n; i++) cin >> s[i]; sort(s,s+n);
      |                                          ^~~~

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