Submission #332621

#	Time	Username	Problem	Language	Result	Execution time	Memory
332621		casperwang	Selling RNA Strands (JOI16_selling_rna)	C++14	0 / 100	70 ms	49132 KiB

selling_rna

#include <bits/stdc++.h>
#define int long long
#define pb push_back
using namespace std;

const int MAXN = 100000;
const int MOD = 1000000007;
const int K = 880301;
int n, m;
string s[MAXN];
vector <int> pre_hash[MAXN];
vector <int> suf_hash[MAXN];
string p, q;
int now, ans;

bool pre(int a, int b, int len) {
  if (s[a].size() < len) return 0;
  return pre_hash[a][len-1] == b;
}

bool suf(int a, int b, int len) {
  if (s[a].size() < len) return 0;
  return suf_hash[a][len-1] == b;
}

signed main() {
  ios_base::sync_with_stdio(0), cin.tie(0);
  cin >> n >> m;
  for (int i = 0; i < n; i++)
    cin >> s[i];
  sort(s, s+n);
  for (int i = 0; i < n; i++) {
    int h = 0;
    for (int j = 0; j < s[i].size(); j++) {
      h = (h * K + s[i][j]) % MOD;
      pre_hash[i].pb(h);
    }
    h = 0;
    for (int j = s[i].size()-1; j >= 0; j--) {
      h = (h * K + s[i][j]) % MOD;
      suf_hash[i].pb(h);
    }
  }
  return 0;
  for (int i = 0; i < m; i++) {
    cin >> p >> q;
    int hp = 0;
    for (int j = 0; j < p.size(); j++)
      hp = (hp * K + p[j]) % MOD;
    int hq = 0;
    for (int j = q.size()-1; j >= 0; j--)
      hq = (hq * K + q[j]) % MOD;
    now = lower_bound(s, s+n, p) - s;
    ans = 0;
    while (now < n && pre(now, hp, p.size())) {
      if (suf(now, hq, q.size())) ans++;
      now++;
    }
    cout << ans << "\n";
  }
  return 0;
}

Compilation message (stderr)

selling_rna.cpp: In function 'bool pre(long long int, long long int, long long int)':
selling_rna.cpp:17:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   17 |   if (s[a].size() < len) return 0;
      |       ~~~~~~~~~~~~^~~~~
selling_rna.cpp: In function 'bool suf(long long int, long long int, long long int)':
selling_rna.cpp:22:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   22 |   if (s[a].size() < len) return 0;
      |       ~~~~~~~~~~~~^~~~~
selling_rna.cpp: In function 'int main()':
selling_rna.cpp:34:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |     for (int j = 0; j < s[i].size(); j++) {
      |                     ~~^~~~~~~~~~~~~
selling_rna.cpp:48:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |     for (int j = 0; j < p.size(); j++)
      |                     ~~^~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 25
• Subtask 3: 0 / 25
• Subtask 4: 0 / 40