oj.uz

Submission #1067406

# Submission time Handle Problem Language Result Execution time Memory
1067406 2024-08-20T16:33:19 Z Whisper Let's Win the Election (JOI22_ho_t3) C++17
10 / 100
 417 ms 6448 KB 
#include <bits/stdc++.h>

using namespace std;
using ll = long long;

#define int long long
#define FOR(i, a, b) for (int i = (a); i <= (b); i++)
#define FORD(i, a, b) for (int i = (b); i >= (a); i --)
#define REP(i, a) for (int i = 0; i < (a); ++i)
#define REPD(i, a) for (int i = (a) - 1; i >= 0; --i)

#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)


constexpr ll LINF = (1ll << 60);
constexpr int INF = (1ll << 30);
constexpr int Mod = 1e9 + 7;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

/*
    Phu Trong from Nguyen Tat Thanh High School for gifted student
*/

template <class X, class Y>
    bool minimize(X &x, const Y &y){
        X eps = 1e-9;
        if (x > y + eps) {x = y; return 1;}
        return 0;
    }

template <class X, class Y>
    bool maximize(X &x, const Y &y){
        X eps = 1e-9;
        if (x + eps < y) {x = y; return 1;}
        return 0;
    }
#define MAX                 505
int N, K;
int A[MAX], B[MAX];

double dp[2][MAX][MAX];

int cost[MAX][MAX];
void process(void){
    cin >> N >> K;
    for (int i = 1; i <= N; ++i){
        cin >> A[i] >> B[i];
        if(B[i] == -1) B[i] = 1e9;
    }
    vector<int> order(N);
    iota(order.begin(), order.end(), 1);

    sort(order.begin(), order.end(), [&](int &i, int &j){
        return B[i] < B[j];
    });

    vector<int> vals;
    FOR(i, 0, N) FOR(j, 0, N) cost[i][j] = 1e9;
    for (int i = N - 1; i >= 0; --i){
        vals.push_back(A[order[i]]);
        sort(vals.begin(), vals.end());
        int sm = 0;
        for (int j = 0; j < (int)vals.size(); ++j){
            sm += vals[j];
            cost[i][j + 1] = sm;
        }
    }
    FOR(j, 0, K) FOR(k, 0, K) dp[0][j][k] = dp[1][j][k] = 1e9;
    double ans = cost[0][K];
    dp[0][0][0] = 0;
    for (int i = 0; i < N; ++i){
        for (int j = 0; j <= K; ++j){
            for (int k = 0; k <= K; ++k){
                dp[1][j][k] = 1e15;
            }
        }

        for (int j = 0; j <= K; ++j){
            for (int k = 0; k <= j; ++k){
                minimize(dp[1][j][k], dp[0][j][k]);
                if(j > 0)
                    minimize(dp[1][j][k], dp[0][j - 1][k] + (double)A[order[i]] / (double)(k + 1));
                if(j > 0 && k > 0)
                    minimize(dp[1][j][k], dp[0][j - 1][k - 1] + (double)B[order[i]] / (double)(k));

                int need = K - j;
                if(N - i - 1 >= need && i + need < N)
                    minimize(ans, dp[1][j][k] + (double)cost[i + 1][need] / (double)(k + 1));
            }
        }
        swap(dp[0], dp[1]);
    }
    cout << setprecision(10) << fixed << ans;
}
signed main(){
    #define name "Whisper"
    cin.tie(nullptr) -> sync_with_stdio(false);
    //freopen(name".inp", "r", stdin);
    //freopen(name".out", "w", stdout);
    process();
    return (0 ^ 0);
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4440 KB Output is correct
2 Correct 2 ms 4440 KB Output is correct
3 Correct 2 ms 4444 KB Output is correct
4 Correct 3 ms 4444 KB Output is correct
5 Correct 106 ms 6236 KB Output is correct
6 Correct 115 ms 6236 KB Output is correct
7 Correct 185 ms 6236 KB Output is correct
8 Correct 291 ms 6232 KB Output is correct
9 Correct 408 ms 6248 KB Output is correct
10 Correct 252 ms 6448 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4440 KB Output is correct
2 Correct 2 ms 4440 KB Output is correct
3 Correct 2 ms 4444 KB Output is correct
4 Correct 3 ms 4444 KB Output is correct
5 Correct 106 ms 6236 KB Output is correct
6 Correct 115 ms 6236 KB Output is correct
7 Correct 185 ms 6236 KB Output is correct
8 Correct 291 ms 6232 KB Output is correct
9 Correct 408 ms 6248 KB Output is correct
10 Correct 252 ms 6448 KB Output is correct
11 Correct 2 ms 4444 KB Output is correct
12 Correct 127 ms 6436 KB Output is correct
13 Correct 129 ms 6308 KB Output is correct
14 Correct 125 ms 6236 KB Output is correct
15 Correct 263 ms 6236 KB Output is correct
16 Correct 253 ms 6436 KB Output is correct
17 Correct 254 ms 6236 KB Output is correct
18 Correct 394 ms 6236 KB Output is correct
19 Correct 411 ms 6448 KB Output is correct
20 Correct 402 ms 6432 KB Output is correct

Subtask #3
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4440 KB Output is correct
2 Correct 3 ms 4440 KB Output is correct
3 Correct 3 ms 4444 KB Output is correct
4 Correct 3 ms 4444 KB Output is correct
5 Correct 4 ms 4444 KB Output is correct
6 Correct 5 ms 4444 KB Output is correct
7 Correct 3 ms 4444 KB Output is correct
8 Correct 3 ms 4444 KB Output is correct
9 Incorrect 4 ms 4444 KB Output isn't correct
10 Halted 0 ms 0 KB -

Subtask #4
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4440 KB Output is correct
2 Correct 3 ms 4440 KB Output is correct
3 Correct 3 ms 4444 KB Output is correct
4 Correct 3 ms 4444 KB Output is correct
5 Correct 4 ms 4444 KB Output is correct
6 Correct 5 ms 4444 KB Output is correct
7 Correct 3 ms 4444 KB Output is correct
8 Correct 3 ms 4444 KB Output is correct
9 Incorrect 4 ms 4444 KB Output isn't correct
10 Halted 0 ms 0 KB -

Subtask #5
0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4440 KB Output is correct
2 Correct 3 ms 4440 KB Output is correct
3 Correct 3 ms 4444 KB Output is correct
4 Correct 3 ms 4444 KB Output is correct
5 Correct 4 ms 4444 KB Output is correct
6 Correct 5 ms 4444 KB Output is correct
7 Correct 3 ms 4444 KB Output is correct
8 Correct 3 ms 4444 KB Output is correct
9 Incorrect 4 ms 4444 KB Output isn't correct
10 Halted 0 ms 0 KB -

Subtask #6
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 417 ms 6236 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4440 KB Output is correct
2 Correct 2 ms 4440 KB Output is correct
3 Correct 2 ms 4444 KB Output is correct
4 Correct 3 ms 4444 KB Output is correct
5 Correct 106 ms 6236 KB Output is correct
6 Correct 115 ms 6236 KB Output is correct
7 Correct 185 ms 6236 KB Output is correct
8 Correct 291 ms 6232 KB Output is correct
9 Correct 408 ms 6248 KB Output is correct
10 Correct 252 ms 6448 KB Output is correct
11 Correct 2 ms 4444 KB Output is correct
12 Correct 127 ms 6436 KB Output is correct
13 Correct 129 ms 6308 KB Output is correct
14 Correct 125 ms 6236 KB Output is correct
15 Correct 263 ms 6236 KB Output is correct
16 Correct 253 ms 6436 KB Output is correct
17 Correct 254 ms 6236 KB Output is correct
18 Correct 394 ms 6236 KB Output is correct
19 Correct 411 ms 6448 KB Output is correct
20 Correct 402 ms 6432 KB Output is correct
21 Correct 3 ms 4440 KB Output is correct
22 Correct 3 ms 4440 KB Output is correct
23 Correct 3 ms 4444 KB Output is correct
24 Correct 3 ms 4444 KB Output is correct
25 Correct 4 ms 4444 KB Output is correct
26 Correct 5 ms 4444 KB Output is correct
27 Correct 3 ms 4444 KB Output is correct
28 Correct 3 ms 4444 KB Output is correct
29 Incorrect 4 ms 4444 KB Output isn't correct
30 Halted 0 ms 0 KB -