Submission #870585

#	Time	Username	Problem	Language	Result	Execution time	Memory
870585		nguyentunglam	Genetics (BOI18_genetics)	C++17	100 / 100	595 ms	40532 KiB

genetics

#include<bits/stdc++.h>
#define all(v) v.begin(), v.end()
#define endl "\n"
using namespace std;

const int N = 1e5 + 10, base = 1e5 + 1, mod = 1e9 + 7;

int f[N], g[N], p[N];

string s[N];

int32_t main() {
  #define task ""

  cin.tie(0) -> sync_with_stdio(0);

  if (fopen("task.inp", "r")) {
    freopen("task.inp", "r", stdin);
    freopen("task.out", "w", stdout);
  }

  if (fopen(task".inp", "r")) {
    freopen (task".inp", "r", stdin);
    freopen (task".out", "w", stdout);
  }

  int n, m, k; cin >> n >> m >> k;

  p[0] = 1;

  for(int i = 1; i <= n; i++) {
    cin >> s[i];
    p[i] = 1LL * p[i - 1] * base % mod;
  }

  auto add = [&] (int &a, int b) {
    a += b;
    if (a >= mod) a -= mod;
    if (a < 0) a += mod;
  };

  int sum = 0;

  for(int i = 1; i <= n; i++) add(sum, 1LL * p[i] * k % mod);

  for(int j = 0; j < m; j++) {
    int total = 0;

    for(int i = 1; i <= n; i++) {
      add(f[int(s[i][j])], p[i]);
      add(total, p[i]);
    }

    for(int i = 1; i <= n; i++) {
      add(g[i], total);
      add(g[i], -f[int(s[i][j])]);
    }

    for(int i = 1; i <= n; i++) f[int(s[i][j])] = 0;
  }

//  for(int i = 1; i <= n; i++) cout << g[i] << endl;

  for(int i = 1; i <= n; i++) {
     add(sum, -1LL * p[i] * k % mod);
     if (g[i] == sum) return cout << i, 0;
     add(sum, 1LL * p[i] * k % mod);
  }
}

Compilation message (stderr)

genetics.cpp: In function 'int32_t main()':
genetics.cpp:18:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |     freopen("task.inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
genetics.cpp:19:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |     freopen("task.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
genetics.cpp:23:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |     freopen (task".inp", "r", stdin);
      |     ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
genetics.cpp:24:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |     freopen (task".out", "w", stdout);
      |     ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 27 / 27
• Subtask 2: 19 / 19
• Subtask 3: 28 / 28
• Subtask 4: 26 / 26