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Submission #559052

# Submission time Handle Problem Language Result Execution time Memory
559052 2022-05-09T10:08:53 Z nghiass001 Road Closures (APIO21_roads) C++17
5 / 100
 79 ms 33164 KB 
#include <bits/stdc++.h>
#define FOR(i,l,r) for(int i=(l); i<=(r); ++i)
#define REP(i,l,r) for(int i=(l); i<(r); ++i)
#define FORD(i,r,l) for(int i=(r); i>=(l); --i)
#define REPD(i,r,l) for(int i=(r)-1; i>=(l); --i)
#define pii pair<int, int>
using namespace std;
const int N = 1e5 + 5, Ns4 = 2005;
int n;
long long ans[N];
long long dpx[N], val[N];
int sz[Ns4];
long long dp[Ns4][Ns4], dd[Ns4][2];
vector<pii> S[N];

void sub1() {
    sort(S[0].begin(), S[0].end());
    REP(i, 0, n - 1) ans[n - i - 2] = ans[n - i - 1] + S[0][i].first;
}

void sub2() {
    REP(i, 0, n - 1) {
        for(auto [c, v] : S[i]) if (i + 1 == v)
            val[i + 1] = c;
    }
    REP(i, 1, n) ans[0] += val[i];
    REP(i, 2, n) {
        dpx[i] = min(dpx[i - 1] + val[i], dpx[i - 2] + val[i - 1]);
    }
    ans[1] = dpx[n - 1];
}

void DFS(int u, int p, int max_sz) {
    fill(dp[u] + 1, dp[u] + sz[u] + 1, 1e15);
    dp[u][0] = 0;
    int now_sz = min(sz[u], max_sz);
    for(auto [c, v] : S[u]) if (v != p) {
        DFS(v, u, max_sz);
        FORD(i, now_sz, 1) {
            dp[u][i] = min(dp[u][i] + dd[v][1] + c, dp[u][i - 1] + dd[v][0]);
        }
        dp[u][0] += dd[v][1] + c;
    }
    if (now_sz < max_sz) ++now_sz;
    if (now_sz) dd[u][0] = dp[u][now_sz - 1]; else dd[u][0] = 1e15;
    dd[u][1] = min(dd[u][0], dp[u][now_sz]);
}

void sub34() {
    REP(i, 0, n) {
        sz[i] = S[i].size() - 1;
        if (i == 0) ++sz[i];
    }
    REP(i, 0, n) {
        DFS(0, 0, i);
        ans[i] = min(dd[0][1], dd[0][0]);
    }
}

vector<long long> minimum_closure_costs(int N, vector<int> U, vector<int> V, vector<int> W) {
    n = N;
    REP(i, 0, n - 1) {
        S[U[i]].emplace_back(W[i], V[i]);
        S[V[i]].emplace_back(W[i], U[i]);
    }
    if (S[0].size() == n - 1) sub1();
    else if (true) sub34();
    else if (n > 2000) sub2();
    else if (n <= 2000) sub34();

    vector<long long> ret(n);
    REP(i, 0, n) ret[i] = ans[i];
    return ret;
}

Compilation message

roads.cpp: In function 'std::vector<long long int> minimum_closure_costs(int, std::vector<int>, std::vector<int>, std::vector<int>)':
roads.cpp:66:21: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   66 |     if (S[0].size() == n - 1) sub1();
      |         ~~~~~~~~~~~~^~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 3 ms 2772 KB Output is correct
3 Correct 3 ms 2772 KB Output is correct
4 Correct 3 ms 2772 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 2 ms 2772 KB Output is correct
9 Correct 3 ms 2772 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 41 ms 7284 KB Output is correct
13 Correct 58 ms 10492 KB Output is correct
14 Correct 51 ms 9820 KB Output is correct
15 Correct 58 ms 10540 KB Output is correct
16 Correct 65 ms 10716 KB Output is correct
17 Correct 61 ms 10792 KB Output is correct
18 Correct 1 ms 2644 KB Output is correct
19 Correct 53 ms 9736 KB Output is correct

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Runtime error 79 ms 33164 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #3
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Incorrect 3 ms 3176 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Incorrect 3 ms 3176 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #5
0 / 17.0

# Verdict Execution time Memory Grader output
1 Runtime error 63 ms 17772 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #6
0 / 25.0

# Verdict Execution time Memory Grader output
1 Runtime error 63 ms 17772 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #7
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 3 ms 2772 KB Output is correct
3 Correct 3 ms 2772 KB Output is correct
4 Correct 3 ms 2772 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 2 ms 2772 KB Output is correct
9 Correct 3 ms 2772 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 41 ms 7284 KB Output is correct
13 Correct 58 ms 10492 KB Output is correct
14 Correct 51 ms 9820 KB Output is correct
15 Correct 58 ms 10540 KB Output is correct
16 Correct 65 ms 10716 KB Output is correct
17 Correct 61 ms 10792 KB Output is correct
18 Correct 1 ms 2644 KB Output is correct
19 Correct 53 ms 9736 KB Output is correct
20 Correct 1 ms 2644 KB Output is correct
21 Runtime error 79 ms 33164 KB Execution killed with signal 11
22 Halted 0 ms 0 KB -