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답안 #222160

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
222160 2020-04-12T09:13:27 Z VEGAnn Akvizna (COCI19_akvizna) C++14
65 / 130
 1099 ms 262144 KB 
#include <bits/stdc++.h>
#define sz(x) ((int)x.size())
#define pii pair<int,int>
#define ft first
#define sd second
#define MP make_pair
#define all(x) x.begin(),x.end()
#define PB push_back
using namespace std;
typedef long long ll;
typedef long double ld;
const int N = 3010;
const ll OO = 1e18;
const ld E = 1e-9;
vector<int> vc;
ld f[N][N];
int n, k;

struct line{
    ld k, b;

    line(): k(0.0), b(0.0) {}
    line(ld _k, ld _b): k(_k), b(_b) {}
};

deque<line> hull;

ld get_cross_point(line fi, line se){
    return (fi.b - se.b) / (se.k - fi.k);
}

void insert(line nw){
    if (sz(hull) == 0){
        hull.PB(nw);
        return;
    }

    while (sz(hull) > 1){
        ld pt1 = get_cross_point(nw, hull[1]);
        ld pt2 = get_cross_point(hull.back(), hull[0]);

        if (pt2 > pt1) break;

        hull.pop_front();
    }

    hull.push_front(nw);
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);

//    freopen("in.txt","r",stdin);

    cin >> n >> k;

    for (int i = 0; i <= k; i++)
        for (int j = 0; j <= n; j++)
            f[i][j] = -1.0;

    f[0][n] = 0.0;

    for (int i = 1; i <= k; i++) {

        hull.clear();

        if (f[i - 1][n] >= -E)
            insert({-1.0 / ld(n), f[i - 1][n] + 1.0});

        for (int j = n - 1; j >= 0; j--){

            if (sz(hull)) {

                int l = 0, r = sz(hull) - 1;

                while (l < r) {
                    int md = (l + r + 1) >> 1;

                    assert(md > 0);

                    if (get_cross_point(hull[md], hull[md - 1]) + E <= j)
                        l = md;
                    else r = md - 1;
                }

                f[i][j] = hull[l].b + hull[l].k * ld(j);
            }

            // may be this should be after update f[i][j]
            if (f[i - 1][j] >= -E)
                insert({-1.0 / ld(j), f[i - 1][j] + 1.0});
        }
    }

    cout << fixed << setprecision(10) << f[k][0];

    return 0;
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 512 KB Output is correct
3 Correct 5 ms 768 KB Output is correct

Subtask #2
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 640 KB Output is correct
3 Correct 6 ms 768 KB Output is correct

Subtask #3
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 512 KB Output is correct
3 Correct 5 ms 640 KB Output is correct

Subtask #4
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 768 KB Output is correct
3 Correct 5 ms 768 KB Output is correct

Subtask #5
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 300 ms 19792 KB Output is correct
2 Correct 937 ms 73976 KB Output is correct
3 Correct 962 ms 105336 KB Output is correct

Subtask #6
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 402 ms 26108 KB Output is correct
2 Correct 848 ms 64888 KB Output is correct
3 Correct 1020 ms 114424 KB Output is correct

Subtask #7
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 326 ms 21120 KB Output is correct
2 Correct 584 ms 46400 KB Output is correct
3 Correct 896 ms 108640 KB Output is correct

Subtask #8
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 408 ms 27060 KB Output is correct
2 Correct 808 ms 59640 KB Output is correct
3 Correct 954 ms 114424 KB Output is correct

Subtask #9
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 281 ms 18176 KB Output is correct
2 Correct 782 ms 58872 KB Output is correct
3 Correct 896 ms 97400 KB Output is correct

Subtask #10
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 267 ms 18048 KB Output is correct
2 Correct 1002 ms 81312 KB Output is correct
3 Correct 1099 ms 113656 KB Output is correct

Subtask #11
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 271 ms 16640 KB Output is correct
2 Correct 985 ms 81528 KB Output is correct
3 Correct 1081 ms 126072 KB Output is correct

Subtask #12
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 263 ms 16768 KB Output is correct
2 Correct 788 ms 61304 KB Output is correct
3 Correct 1004 ms 110600 KB Output is correct

Subtask #13
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 385 ms 24192 KB Output is correct
2 Correct 842 ms 70580 KB Output is correct
3 Correct 1022 ms 114552 KB Output is correct

Subtask #14
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 796 ms 262144 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 796 ms 262144 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 798 ms 262144 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 807 ms 262144 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 809 ms 262144 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 826 ms 262144 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 807 ms 262144 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 776 ms 262144 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #22
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 834 ms 262144 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #23
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 823 ms 262144 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #24
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 826 ms 262144 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #25
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 838 ms 262144 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #26
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 820 ms 262144 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -