Submission #883607

#	Time	Username	Problem	Language	Result	Execution time	Memory
883607		mgl_diamond	Nivelle (COCI20_nivelle)	C++17	110 / 110	66 ms	552 KiB

nivelle

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ii = pair<int, int>;
 
#define foru(i, l, r) for(int i=(l); i<=(r); ++i)
#define ford(i, l, r) for(int i=(l); i>=(r); --i)
#define fore(x, v) for(auto &x : v)
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
#define fi first
#define se second
#define file "input"

template<class T> bool minimize(T &a, T b) { if (a > b) { a = b; return 1; } return 0; }
template<class T> bool maximize(T &a, T b) { if (a < b) { a = b; return 1; } return 0; }

void setIO() {
  ios::sync_with_stdio(0);
  cin.tie(0); cout.tie(0);
  if (fopen(file".inp", "r")) {
    freopen(file".inp", "r", stdin);
    freopen(file".out", "w", stdout);
  }
}

const int N = 1e5+5;
int n;
string s;

int main() {
  setIO();  

  vector<int> lst(26);
  cin >> n;

  double best = N;
  int a1, a2;

  foru(i, 1, n) {
    char c;
    cin >> c;
    c -= 'a';
    lst[c] = i;

    vector<int> range;
    foru(j, 0, 25) if (lst[j] > 0) 
      range.push_back(lst[j]);
    sort(all(range));

    // cout << "I " << i << "\n";

    ford(j, sz(range)-1, 0) {
      int len = i - (j == 0 ? 0 : range[j-1]);
      // cout << double(sz(range) - j) / double(len) << "\n";
      if (double(sz(range) - j) / double(len) < best) {
        a1 = i-len+1;
        a2 = i;
        best = double(sz(range) - j) / double(len);
      }
    }
  }
  cout << a1 << " " << a2;
}

Compilation message (stderr)

nivelle.cpp: In function 'void setIO()':
nivelle.cpp:22:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |     freopen(file".inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
nivelle.cpp:23:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |     freopen(file".out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
nivelle.cpp: In function 'int main()':
nivelle.cpp:63:24: warning: 'a2' may be used uninitialized in this function [-Wmaybe-uninitialized]
   63 |   cout << a1 << " " << a2;
      |                        ^~
nivelle.cpp:63:17: warning: 'a1' may be used uninitialized in this function [-Wmaybe-uninitialized]
   63 |   cout << a1 << " " << a2;
      |                 ^~~

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