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답안 #289043

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
289043 2020-09-02T09:57:18 Z evpipis Mousetrap (CEOI17_mousetrap) C++11
65 / 100
 5000 ms 150768 KB 
#include <bits/stdc++.h>
using namespace std;

#define fi first
#define se second
#define mp make_pair
#define pb push_back
typedef pair<int, int> ii;

const int len = 1e6+5, inf = 1e9;
vector<int> adj[len], cost[len], order;
int block[len], dp[2][len];

int fix_order(int u, int p, int en){
    if (u == en){
        block[u] = 1;
        return 1;
    }

    for (auto v: adj[u]){
        if (v == p) continue;

        if (fix_order(v, u, en)){
            order.pb(u);
            block[u] = 1;
            return 1;
        }
    }

    return 0;
}

int run_dfs(int u, int p){
    int mx1 = 0, mx2 = 0, kids = 0;
    for (auto v: adj[u]){
        if (v == p) continue;

        kids++;

        int cur = run_dfs(v, u);
        if (cur > mx1)
            mx2 = mx1, mx1 = cur;
        else if (cur > mx2)
            mx2 = cur;
    }

    return mx2+kids;
}

int main(){
    int n, en, st;
    scanf("%d %d %d", &n, &en, &st);
    for (int i = 0; i < n-1; i++){
        int a, b;
        scanf("%d %d", &a, &b);
        adj[a].pb(b);
        adj[b].pb(a);
    }


    fix_order(st, st, en);
    reverse(order.begin(), order.end());

    for (int i = (int)order.size()-1, cnt = 0; i >= 0; i--){
        int u = order[i];

        //printf("i = %d, u = %d\n", i, u);
        for (auto v: adj[u]){
            if (block[v]) continue;

            cost[i].pb(run_dfs(v, u)+1);

            //printf("%d -> %d, cost = %d\n", u, v, cost[i].back());
        }

        sort(cost[i].begin(), cost[i].end());
        reverse(cost[i].begin(), cost[i].end());

        for (int j = (int)cost[i].size()-1; j >= 0; j--)
            cost[i][j] += cnt++;
    }

    for (int i = (int)order.size()-1; i >= 0; i--){
        for (int rem = 1; rem <= i+1; rem++){
            dp[i&1][rem] = inf;
            cost[i].pb(0);
            //if (rem >= cost[i].size())
              //  dp[i&1][rem] = cost[i].size() + dp[(i+1)&1][rem-cost[i].size()+1];

            //int opt = -1;
            for (int j = 0; j < cost[i].size() && j <= rem; j++){
                //if (j <= rem && cost[i][j] >= dp[(i+1)&1][rem-j+1])
                  //  opt = j;
                //if (j <= rem)
                dp[i&1][rem] = min(dp[i&1][rem], j+max(cost[i][j], dp[(i+1)&1][rem-j+1]));
            }

            /*
            if (opt != -1)
                dp[i&1][rem] = min(dp[i&1][rem], opt + cost[i][opt]);
            else
                dp[i&1][rem] = min(dp[i&1][rem], dp[(i+1)&1][rem+1]);
            */
        }
    }

    printf("%d\n", dp[0][1]);
    return 0;
}

Compilation message

mousetrap.cpp: In function 'int main()':
mousetrap.cpp:91:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |             for (int j = 0; j < cost[i].size() && j <= rem; j++){
      |                             ~~^~~~~~~~~~~~~~~~
mousetrap.cpp:52:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   52 |     scanf("%d %d %d", &n, &en, &st);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
mousetrap.cpp:55:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   55 |         scanf("%d %d", &a, &b);
      |         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 32 ms 47224 KB Output is correct
2 Correct 32 ms 47360 KB Output is correct
3 Correct 32 ms 47352 KB Output is correct
4 Correct 33 ms 47228 KB Output is correct
5 Correct 32 ms 47352 KB Output is correct
6 Correct 32 ms 47360 KB Output is correct
7 Correct 33 ms 47232 KB Output is correct
8 Correct 33 ms 47348 KB Output is correct
9 Correct 33 ms 47224 KB Output is correct
10 Correct 32 ms 47232 KB Output is correct

Subtask #2
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 437 ms 78776 KB Output is correct
2 Correct 386 ms 75512 KB Output is correct
3 Correct 882 ms 79864 KB Output is correct
4 Correct 420 ms 63608 KB Output is correct
5 Correct 880 ms 79736 KB Output is correct
6 Correct 889 ms 79864 KB Output is correct

Subtask #3
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 32 ms 47224 KB Output is correct
2 Correct 32 ms 47360 KB Output is correct
3 Correct 32 ms 47352 KB Output is correct
4 Correct 33 ms 47228 KB Output is correct
5 Correct 32 ms 47352 KB Output is correct
6 Correct 32 ms 47360 KB Output is correct
7 Correct 33 ms 47232 KB Output is correct
8 Correct 33 ms 47348 KB Output is correct
9 Correct 33 ms 47224 KB Output is correct
10 Correct 32 ms 47232 KB Output is correct
11 Correct 32 ms 47360 KB Output is correct
12 Correct 33 ms 47360 KB Output is correct
13 Correct 32 ms 47352 KB Output is correct
14 Correct 299 ms 50040 KB Output is correct
15 Correct 227 ms 49660 KB Output is correct
16 Correct 32 ms 47360 KB Output is correct
17 Correct 33 ms 47360 KB Output is correct
18 Correct 33 ms 47360 KB Output is correct
19 Correct 33 ms 47356 KB Output is correct
20 Correct 33 ms 47360 KB Output is correct
21 Correct 33 ms 47360 KB Output is correct
22 Correct 32 ms 47352 KB Output is correct

Subtask #4
0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 32 ms 47224 KB Output is correct
2 Correct 32 ms 47360 KB Output is correct
3 Correct 32 ms 47352 KB Output is correct
4 Correct 33 ms 47228 KB Output is correct
5 Correct 32 ms 47352 KB Output is correct
6 Correct 32 ms 47360 KB Output is correct
7 Correct 33 ms 47232 KB Output is correct
8 Correct 33 ms 47348 KB Output is correct
9 Correct 33 ms 47224 KB Output is correct
10 Correct 32 ms 47232 KB Output is correct
11 Correct 437 ms 78776 KB Output is correct
12 Correct 386 ms 75512 KB Output is correct
13 Correct 882 ms 79864 KB Output is correct
14 Correct 420 ms 63608 KB Output is correct
15 Correct 880 ms 79736 KB Output is correct
16 Correct 889 ms 79864 KB Output is correct
17 Correct 32 ms 47360 KB Output is correct
18 Correct 33 ms 47360 KB Output is correct
19 Correct 32 ms 47352 KB Output is correct
20 Correct 299 ms 50040 KB Output is correct
21 Correct 227 ms 49660 KB Output is correct
22 Correct 32 ms 47360 KB Output is correct
23 Correct 33 ms 47360 KB Output is correct
24 Correct 33 ms 47360 KB Output is correct
25 Correct 33 ms 47356 KB Output is correct
26 Correct 33 ms 47360 KB Output is correct
27 Correct 33 ms 47360 KB Output is correct
28 Correct 32 ms 47352 KB Output is correct
29 Correct 32 ms 47352 KB Output is correct
30 Correct 425 ms 78884 KB Output is correct
31 Correct 433 ms 78968 KB Output is correct
32 Execution timed out 5098 ms 150768 KB Time limit exceeded
33 Halted 0 ms 0 KB -