oj.uz

답안 #745857

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
745857 2023-05-21T08:49:35 Z chanhchuong123 악어의 지하 도시 (IOI11_crocodile) C++14
100 / 100
 530 ms 62192 KB 
#include <bits/stdc++.h>
using namespace std;
#define task ""
#define fi first
#define se second
#define MASK(i) (1 << (i))
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define BIT(mask, i) ((mask) >> (i) & 1)
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; ++i)
#define FORD(i, a, b) for (int i = (b), _a = (a); i >= _a; --i)

template <typename T1, typename T2> bool minimize(T1 &a, T2 b) {
	if (a > b) {a = b; return true;} return false;
}
template <typename T1, typename T2> bool maximize(T1 &a, T2 b) {
	if (a < b) {a = b; return true;} return false;
}

const int dx[] = {-1, 0, 0, +1};
const int dy[] = {0, -1, +1, 0};

const int INF = 2e9 + 7;
const int MAX = 100100;
int n, m, k;
bool exist[MAX];
vector<pair<int, int>> adj[MAX];

namespace subtask1 {
    int dp[MAX];

    void dfs(int u, int p) {
        if (u && adj[u].size() == 1) {
            if (exist[u]) dp[u] = 0;
            return;
        }

        vector<long long> arr;
        for (pair<int, int> &x: adj[u]) if (x.fi != p) {
            int v = x.fi, w = x.se; dfs(v, u);
            if (dp[v] != INF) arr.push_back(w + dp[v]);
        }

        if (arr.size() > 1) {
            sort(all(arr));
            dp[u] = arr[1];
        }
    }

    int solve(void) {
        for (int i = 0; i < n; ++i) dp[i] = INF; dfs(0, -1);
        return (dp[0] == INF ? -1 : dp[0]);
    }
}

namespace fullsubtask {
    struct node {
        int u, t, dist;

        node(int _u = 0, int _t = 0, int _dist = 0) {
            u = _u; t = _t; dist = _dist;
        }

        bool operator< (const node &other) const {
            return dist > other.dist;
        }
    };
    priority_queue<node> pq;

    int d[MAX][2];

    int solve(void) {
        for (int i = 0; i < n; ++i) d[i][0] = d[i][1] = INF;
        for (int i = 0; i < n; ++i) if (exist[i]) {
            pq.push(node(i, 1, 0));
            d[i][0] = 0;
            d[i][1] = 0;
        }
        while (pq.size()) {
            int u = pq.top().u;
            int t = pq.top().t;
            int dist = pq.top().dist;
            pq.pop();
            if (t == 0) continue;
            if (dist != d[u][t]) continue;

            for (pair<int, int> &x: adj[u]) {
                int v = x.fi, w = x.se;
                for (int i = 0; i < 2; ++i) if (d[v][i] >= dist + w) {
                    for (int j = 1; j > i; --j) {
                        if (minimize(d[v][j], d[v][j - 1]) && j)
                            pq.push(node(v, j, d[v][j]));
                    }
                    if (minimize(d[v][i], dist + w) && i)
                        pq.push(node(v, i, d[v][i]));
                    break;
                }
            }
        }
        return (d[0][1] == INF ? -1 : d[0][1]);
    }
}

int travel_plan(int N, int M, int R[][2], int L[], int K, int P[]) {
    n = N; m = M; k = K;
    for (int i = 0; i < m; ++i) {
        adj[R[i][0]].push_back({R[i][1], L[i]});
        adj[R[i][1]].push_back({R[i][0], L[i]});
    }
    for (int i = 0; i < k; ++i) {
        exist[P[i]] = true;
    }
    if (m == n - 1) return subtask1::solve();
    return fullsubtask::solve();
}

Compilation message

crocodile.cpp: In function 'int subtask1::solve()':
crocodile.cpp:51:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   51 |         for (int i = 0; i < n; ++i) dp[i] = INF; dfs(0, -1);
      |         ^~~
crocodile.cpp:51:50: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   51 |         for (int i = 0; i < n; ++i) dp[i] = INF; dfs(0, -1);
      |                                                  ^~~

Subtask #1
46.0 / 46.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 2644 KB Output is correct
2 Correct 3 ms 2672 KB Output is correct
3 Correct 2 ms 2680 KB Output is correct
4 Correct 3 ms 2644 KB Output is correct
5 Correct 3 ms 2772 KB Output is correct
6 Correct 2 ms 2680 KB Output is correct
7 Correct 2 ms 2772 KB Output is correct
8 Correct 2 ms 2812 KB Output is correct

Subtask #2
43.0 / 43.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 2644 KB Output is correct
2 Correct 3 ms 2672 KB Output is correct
3 Correct 2 ms 2680 KB Output is correct
4 Correct 3 ms 2644 KB Output is correct
5 Correct 3 ms 2772 KB Output is correct
6 Correct 2 ms 2680 KB Output is correct
7 Correct 2 ms 2772 KB Output is correct
8 Correct 2 ms 2812 KB Output is correct
9 Correct 3 ms 2900 KB Output is correct
10 Correct 3 ms 2644 KB Output is correct
11 Correct 4 ms 2772 KB Output is correct
12 Correct 5 ms 3156 KB Output is correct
13 Correct 6 ms 3156 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 2 ms 2772 KB Output is correct

Subtask #3
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 2644 KB Output is correct
2 Correct 3 ms 2672 KB Output is correct
3 Correct 2 ms 2680 KB Output is correct
4 Correct 3 ms 2644 KB Output is correct
5 Correct 3 ms 2772 KB Output is correct
6 Correct 2 ms 2680 KB Output is correct
7 Correct 2 ms 2772 KB Output is correct
8 Correct 2 ms 2812 KB Output is correct
9 Correct 3 ms 2900 KB Output is correct
10 Correct 3 ms 2644 KB Output is correct
11 Correct 4 ms 2772 KB Output is correct
12 Correct 5 ms 3156 KB Output is correct
13 Correct 6 ms 3156 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 2 ms 2772 KB Output is correct
16 Correct 462 ms 56804 KB Output is correct
17 Correct 75 ms 13764 KB Output is correct
18 Correct 82 ms 15184 KB Output is correct
19 Correct 530 ms 62192 KB Output is correct
20 Correct 277 ms 49632 KB Output is correct
21 Correct 40 ms 7584 KB Output is correct
22 Correct 282 ms 46000 KB Output is correct