oj.uz

답안 #624148

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
624148 2022-08-07T10:27:13 Z slime Let's Win the Election (JOI22_ho_t3) C++14
10 / 100
 901 ms 993752 KB 
#include "bits/stdc++.h"
using namespace std;
#define int long long
const int MAXN = 3e5 + 10;
const int MOD = 998244353;
#define ll __int128
mt19937_64 rng((int)std::chrono::steady_clock::now().time_since_epoch().count());
int rnd(int x, int y) {
  int u = uniform_int_distribution<int>(x, y)(rng); return u;
}
ll read() { int x; cin >> x; return (ll)x; }
long long bm(long long b, long long p) {
  if(p==0) return 1 % MOD;
  long long r = bm(b, p >> 1);
  if(p&1) return (((r*r) % MOD) * b) % MOD;
  return (r*r) % MOD;
}
long long inv(long long b) { 
  return bm(b, MOD-2);
}
long long f[MAXN];
long long nCr(int n, int r) { 
  long long ans = f[n]; ans *= inv(f[r]); ans %= MOD;
  ans *= inv(f[n-r]); ans %= MOD; return ans;
}
long long fib[MAXN], lucas[MAXN];
void precomp() { 
  for(int i=0; i<MAXN; i++) f[i] = (i == 0 ? 1 % MOD : (f[i-1] * i) % MOD); 
  lucas[0] = 2;
  lucas[1] = 1;
  for(int i=2; i<MAXN; i++) lucas[i] = (lucas[i-2] + lucas[i-1]) % MOD;
  fib[0] = 0;
  fib[1] = 1;
  for(int i=2; i<MAXN; i++) fib[i] = (fib[i-2] + fib[i-1]) % MOD;
}
int fastlog(int x) {
  return (x == 0 ? -1 : 64 - __builtin_clzll(x) - 1);
}
void google(int i) { cout << "Case #" << i << ": "; }
int csb(int l, int r, int k) { // count number of [l, r] such that i & 2^k > 0
  if(l > r) return 0;
  if(l == 0) {
    int s = r / (1ll << (k+1)); // number of complete cycles
    int t = r % (1ll << (k+1));
    int ans = s * (1ll << k);
    ans += (t >= (1ll << k) ? t - (1ll << k) + 1 : 0);
    return ans;
  }
  else return csb(0, r, k) - csb(0, l - 1, k);
}
int lis(vector<int> a) {
  int n = a.size();
  int bucket[n+1];
  for(int i=1; i<=n; i++) bucket[i] = 1e18;
  int ans = 1;
  for(int x: a) {
    auto it = lower_bound(bucket + 1, bucket +n +1, x);
    int d = distance(bucket, it);
    ans = max(ans, d);
    bucket[d] = min(bucket[d], x);
  }
  return ans;
}
bool cmp(pair<int, int> x, pair<int, int> y) {
  if(x.second == y.second) return x.first < y.first;
  return x.second < y.second;
}
void solve(int tc) {
  int n, k;
  cin >> n >> k;
  int a[n+1], b[n+1];
  pair<int, int> p[n+1];
  for(int i=1; i<=n; i++) {
    cin >> p[i].first >> p[i].second;
    if(p[i].second == -1) p[i].second = 1226;
  }
  sort(p+1, p+n+1, cmp);
  for(int i=1; i<=n; i++) a[i] = p[i].first, b[i] = p[i].second;


  double dp[k+1][n+2][n+1];
  for(int i=0; i<=k; i++) for(int j=0; j<n+2; j++) for(int l=0; l<n+1; l++) dp[i][j][l] = 1e18;
  dp[0][1][0] = 0;
  for(int i=1; i<=k; i++) {
    for(int j=1; j<=n+1; j++) {
      for(int l=1; l<=n; l++) {
        // include l, 'A'
        dp[i][j][l] = dp[i-1][j][l-1] + a[l] * 1.0 / j;
        // include l, 'B'
        if(b[l] != 1226) dp[i][j][l] = min(dp[i][j][l], dp[i-1][j-1][l-1] + b[l] * 1.0 / (j-1));
        // don't include l
        dp[i][j][l] = min(dp[i][j][l], dp[i][j][l-1]);
      }
    }
  }
  double ans = 1e18;
  for(int i=1; i<=n+1; i++) ans = min(ans, dp[k][i][n]);
  cout << fixed << setprecision(6) << ans << "\n";

} 
int32_t main() {
  precomp();
  ios::sync_with_stdio(0); cin.tie(0);
  int t = 1; //cin >> t;
  for(int i=1; i<=t; i++) solve(i);
}
// I don't know geometry.
// Teaming is unfair.

/*
7
5
31 33 (2)
19 27 (8)
28 36 (8)
38 51 (13)
20 35 (15)
25 56 (31)
11 57 (46)

7
5
19 27
31 33
20 35
28 36
38 51
25 56
11 57

optimal order:
7
5
19 27
31 33
28 36
38 51
25 56
11 57
20 35
*/

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 7252 KB Output is correct
2 Correct 8 ms 7300 KB Output is correct
3 Correct 7 ms 7252 KB Output is correct
4 Correct 7 ms 7372 KB Output is correct
5 Correct 92 ms 107772 KB Output is correct
6 Correct 228 ms 255424 KB Output is correct
7 Correct 427 ms 501580 KB Output is correct
8 Correct 639 ms 747600 KB Output is correct
9 Correct 859 ms 993728 KB Output is correct
10 Correct 599 ms 698384 KB Output is correct

Subtask #2
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 7252 KB Output is correct
2 Correct 8 ms 7300 KB Output is correct
3 Correct 7 ms 7252 KB Output is correct
4 Correct 7 ms 7372 KB Output is correct
5 Correct 92 ms 107772 KB Output is correct
6 Correct 228 ms 255424 KB Output is correct
7 Correct 427 ms 501580 KB Output is correct
8 Correct 639 ms 747600 KB Output is correct
9 Correct 859 ms 993728 KB Output is correct
10 Correct 599 ms 698384 KB Output is correct
11 Correct 7 ms 7380 KB Output is correct
12 Correct 272 ms 304644 KB Output is correct
13 Correct 279 ms 304652 KB Output is correct
14 Correct 275 ms 304644 KB Output is correct
15 Correct 631 ms 698492 KB Output is correct
16 Correct 637 ms 698388 KB Output is correct
17 Correct 600 ms 698388 KB Output is correct
18 Correct 896 ms 993604 KB Output is correct
19 Correct 864 ms 993692 KB Output is correct
20 Correct 870 ms 993692 KB Output is correct

Subtask #3
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 7 ms 7252 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 7 ms 7252 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 33.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 7 ms 7252 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 901 ms 993752 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 7252 KB Output is correct
2 Correct 8 ms 7300 KB Output is correct
3 Correct 7 ms 7252 KB Output is correct
4 Correct 7 ms 7372 KB Output is correct
5 Correct 92 ms 107772 KB Output is correct
6 Correct 228 ms 255424 KB Output is correct
7 Correct 427 ms 501580 KB Output is correct
8 Correct 639 ms 747600 KB Output is correct
9 Correct 859 ms 993728 KB Output is correct
10 Correct 599 ms 698384 KB Output is correct
11 Correct 7 ms 7380 KB Output is correct
12 Correct 272 ms 304644 KB Output is correct
13 Correct 279 ms 304652 KB Output is correct
14 Correct 275 ms 304644 KB Output is correct
15 Correct 631 ms 698492 KB Output is correct
16 Correct 637 ms 698388 KB Output is correct
17 Correct 600 ms 698388 KB Output is correct
18 Correct 896 ms 993604 KB Output is correct
19 Correct 864 ms 993692 KB Output is correct
20 Correct 870 ms 993692 KB Output is correct
21 Incorrect 7 ms 7252 KB Output isn't correct
22 Halted 0 ms 0 KB -