Submission #295186

#	Time	Username	Problem	Language	Result	Execution time	Memory
295186		arman_ferdous	Selling RNA Strands (JOI16_selling_rna)	C++17	100 / 100	321 ms	296780 KiB

selling_rna

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

#define fi first
#define se second
#define pb push_back
#define sz(v) (int)v.size()
#define all(v) v.begin(),v.end()
#define dbg(x) cerr << #x << " is " << x << "\n";

using ll = long long;
using ii = pair<ll,ll>;

const int N = 1e5+10;
const int M = 5e6+10;

int n, m;
char s[N];

char ID(char x) {
  if(x == 'A') return 'a';
  if(x == 'C') return 'b';
  if(x == 'G') return 'c';
  return 'd';
}

struct Trie{
  int node, to[4][M];
  vector<int> ending[M];

  Trie() { node = 1; }

  void insert(int len, int id) {
    int cur = 1;
    for(int i = 0; i < len; i++) {
      int val = ID(s[i]) - 'a';
      if(to[val][cur] == 0) to[val][cur] = ++node;
      assert(node < M);
      cur = to[val][cur];
    }
    ending[cur].push_back(id);
  }

  int in[M], out[M];
  vector<int> eul;
  void dfs(int u) {
    in[u] = eul.size();
    for(int x : ending[u]) eul.push_back(x);
    for(int v = 0; v < 4; v++) if(to[v][u] != 0)
      dfs(to[v][u]);
    out[u] = eul.size() - 1;
  }

  void find(int &l, int &r) {
    int cur = 1, len = strlen(s);
    for(int i = 0; i < len; i++) {
      int val = ID(s[i]) - 'a';
      if(to[val][cur] == 0) {
        l = r = -1;
        return;
      } cur = to[val][cur];
    }
    l = in[cur], r = out[cur];
  }
}trie, eirt;

int result[N];
struct CPR{
  struct data{
    int x, y1, y2;
    int ty, id;
    // point = 0, [ = -1, ] = 1
    bool operator<(data o) const {
      if(x == o.x) return ty < o.ty;
      return x < o.x;
    }
  };
  vector<data> v;

  void insert_point(int x, int y) {
    x++, y++;
    v.push_back({x, y, 0, 0, 0});
  }
  void insert_rect(int x1, int x2, int y1, int y2, int id) {
    x1++, y1++, x2++, y2++;
    v.push_back({x1, y1, y2, -1, id});
    v.push_back({x2, y1, y2, +1, id});
  }

  int bit[N];
  void upd(int pos, int x) {
    while(pos < N) bit[pos] += x, pos += pos&-pos;
  }
  int get(int pos, int r = 0) {
    while(pos > 0) r += bit[pos], pos -= pos&-pos;
    return r;
  }

  void sweep() {
    sort(all(v));
    for(auto d : v) {
      if(d.ty == 0) upd(d.y1, +1);
      else result[d.id] += d.ty * (get(d.y2) - get(d.y1 - 1));
    }
  }
}ds;

int mp[M];

int main() {
  scanf("%d %d", &n, &m);
  for(int i = 0; i < n; i++) {
    scanf(" %s", s);
    int len = strlen(s);
    trie.insert(len, i);
    reverse(s, s + len);
    eirt.insert(len, i);
  }
  trie.dfs(1); eirt.dfs(1);
  for(int i = 0; i < n; i++) mp[trie.eul[i]] = i;
  for(int i = 0; i < n; i++) {
    eirt.eul[i] = mp[eirt.eul[i]];
    ds.insert_point(i, eirt.eul[i]);
  }
  for(int i = 0; i < m; i++) {
    scanf(" %s", s);
    int l, r; trie.find(l, r);

    scanf(" %s", s);
    reverse(s, s + strlen(s));
    int L, R; eirt.find(L, R);

    if(l != -1 && L != -1 && l <= r && L <= R) ds.insert_rect(L, R, l, r, i);
  }
  ds.sweep();
  for(int i = 0; i < m; i++)
    printf("%d\n", result[i]);
  return 0;
}

Compilation message (stderr)

selling_rna.cpp: In function 'int main()':
selling_rna.cpp:111:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  111 |   scanf("%d %d", &n, &m);
      |   ~~~~~^~~~~~~~~~~~~~~~~
selling_rna.cpp:113:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  113 |     scanf(" %s", s);
      |     ~~~~~^~~~~~~~~~
selling_rna.cpp:126:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  126 |     scanf(" %s", s);
      |     ~~~~~^~~~~~~~~~
selling_rna.cpp:129:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  129 |     scanf(" %s", s);
      |     ~~~~~^~~~~~~~~~

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