Submission #638272

#	Time	Username	Problem	Language	Result	Execution time	Memory
638272		iee	Nivelle (COCI20_nivelle)	C++17	110 / 110	213 ms	11284 KiB

nivelle

// iee
#include <algorithm>
#include <iostream>
#include <cstring>
#include <cstdio>
#include <vector>
#include <set>
#include <map>

#define rep(i, a, b) for (auto i = (a); i <= (b); ++i)
#define per(i, a, b) for (auto i = (a); i >= (b); --i)
#define fi first
#define se second
using ll = long long;
using ull = unsigned long long;
using namespace std;
void work(int);

template <class T> void read(T &x) {
  x = 0; int f = 1, ch = getchar();
  while (!isdigit(ch)) { if (ch == '-') f = -1; ch = getchar(); }
  while (isdigit(ch)) x = x * 10 + (ch - '0'), ch = getchar();
  x *= f;
}

int main() {
  int TT = 1; // cin >> TT;
  rep(CAS, 1, TT)
    work(CAS);
  return 0;
}
const int N = 1e5 + 5;
vector<int> pos[26];
int n;
double ans = 1e9;
int ansl, ansr;
char s[N];
int sum[N][26];
void work(int CASE) {
  scanf("%d%s", &n, s + 1);
  rep(i, 1, n)
    pos[s[i] - 'a'].push_back(i);
  rep(i, 1, n) {
    rep(j, 0, 25) sum[i][j] = sum[i - 1][j];
    sum[i][s[i] - 'a']++;
  }
  rep(i, 1, n) {
    vector<int> hf;
    rep(j, 0, 25) {
      auto it = upper_bound(begin(pos[j]), end(pos[j]), i);
      if (it != end(pos[j])) hf.emplace_back((*it) - 1);
    }
    hf.emplace_back(n);
    sort(begin(hf), end(hf));
    for (int t = 0; t < hf.size(); ++t) {
      int num = 0, j = hf[t], len = j - i + 1;
      rep(k, 0, 25) num += !!(sum[j][k] - sum[i - 1][k]);
      if (1.0 * num / len < ans) {
        ans = 1.0 * num / len;
        ansl = i;
        ansr = j;
      }
    }
  }
  cout << ansl << ' ' << ansr;
}

Compilation message (stderr)

nivelle.cpp: In function 'void work(int)':
nivelle.cpp:55:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |     for (int t = 0; t < hf.size(); ++t) {
      |                     ~~^~~~~~~~~~~
nivelle.cpp:40:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |   scanf("%d%s", &n, s + 1);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 17 / 17
• Subtask 3: 13 / 13
• Subtask 4: 25 / 25
• Subtask 5: 48 / 48