oj.uz

답안 #624150

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
624150 2022-08-07T10:29:25 Z slime Let's Win the Election (JOI22_ho_t3) C++14
10 / 100
 918 ms 993876 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 && j > 1) 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 7 ms 7244 KB Output is correct
2 Correct 7 ms 7252 KB Output is correct
3 Correct 9 ms 7352 KB Output is correct
4 Correct 7 ms 7252 KB Output is correct
5 Correct 90 ms 107772 KB Output is correct
6 Correct 225 ms 255420 KB Output is correct
7 Correct 442 ms 501508 KB Output is correct
8 Correct 638 ms 747596 KB Output is correct
9 Correct 871 ms 993732 KB Output is correct
10 Correct 616 ms 698376 KB Output is correct

Subtask #2
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 7244 KB Output is correct
2 Correct 7 ms 7252 KB Output is correct
3 Correct 9 ms 7352 KB Output is correct
4 Correct 7 ms 7252 KB Output is correct
5 Correct 90 ms 107772 KB Output is correct
6 Correct 225 ms 255420 KB Output is correct
7 Correct 442 ms 501508 KB Output is correct
8 Correct 638 ms 747596 KB Output is correct
9 Correct 871 ms 993732 KB Output is correct
10 Correct 616 ms 698376 KB Output is correct
11 Correct 7 ms 7252 KB Output is correct
12 Correct 279 ms 304640 KB Output is correct
13 Correct 267 ms 304584 KB Output is correct
14 Correct 292 ms 304660 KB Output is correct
15 Correct 614 ms 698492 KB Output is correct
16 Correct 645 ms 698312 KB Output is correct
17 Correct 631 ms 698384 KB Output is correct
18 Correct 898 ms 993876 KB Output is correct
19 Correct 906 ms 993760 KB Output is correct
20 Correct 889 ms 993716 KB Output is correct

Subtask #3
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 8 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 8 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 8 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 918 ms 993684 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 7244 KB Output is correct
2 Correct 7 ms 7252 KB Output is correct
3 Correct 9 ms 7352 KB Output is correct
4 Correct 7 ms 7252 KB Output is correct
5 Correct 90 ms 107772 KB Output is correct
6 Correct 225 ms 255420 KB Output is correct
7 Correct 442 ms 501508 KB Output is correct
8 Correct 638 ms 747596 KB Output is correct
9 Correct 871 ms 993732 KB Output is correct
10 Correct 616 ms 698376 KB Output is correct
11 Correct 7 ms 7252 KB Output is correct
12 Correct 279 ms 304640 KB Output is correct
13 Correct 267 ms 304584 KB Output is correct
14 Correct 292 ms 304660 KB Output is correct
15 Correct 614 ms 698492 KB Output is correct
16 Correct 645 ms 698312 KB Output is correct
17 Correct 631 ms 698384 KB Output is correct
18 Correct 898 ms 993876 KB Output is correct
19 Correct 906 ms 993760 KB Output is correct
20 Correct 889 ms 993716 KB Output is correct
21 Incorrect 8 ms 7252 KB Output isn't correct
22 Halted 0 ms 0 KB -