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답안 #1056022

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1056022 2024-08-13T07:13:56 Z 캐나다 선발고사 레전드(#11109) Summer Driving (CCO24_day1problem3) C++17
9 / 25
 155 ms 29788 KB 
#include <bits/stdc++.h>
using namespace std;

int n,r,a,b;
const int MAX=3005;
int ind[MAX];
int sz[MAX];
int md[MAX];
vector<int> adj[MAX];
int dep[MAX];
int f=0;
int p[MAX];
int par[MAX][MAX];

void dfs(int v,int pr) {
    p[v]=pr;
    md[v]=dep[v];
    sz[v]=1;
    ind[v]=f++;
    for(int i=0;i<adj[v].size();i++) {
        int nt=adj[v][i];
        if (nt!=pr) {
            dep[nt]=dep[v]+1;
            dfs(nt,v);
            md[v]=max(md[v],md[nt]);
            sz[v]+=sz[nt];
        }
    }
}

int dp[MAX][2][2];
int dist[MAX];
queue<int> q;

int ans(int v,int t1,int t) { //t1=1�̸� v�� �θ𿡼� v �������δ� �� ���� ���� t=0�� alice, t=1�� bob
    if (dp[v][t1][t]!=-1) {
        return dp[v][t1][t];
    }
    if (t==0) {
        int now=(t1?p[v]:v);
        int ret=0;
        for(int i=1;i<=n;i++) {
            if (ind[now]<=ind[i]&&ind[i]<=ind[now]+sz[now]-1) {
                if (t1&&ind[v]<=ind[i]&&ind[i]<=ind[v]+sz[v]-1) {
                    continue;
                }
                if (dep[i]==dep[now]+a) {
                    ret=max(ret,ans(i,0,1));
                }
            }
        }
        if (ret==0) {
                ret=n;
            for(int i=1;i<=n;i++) {
                if (ind[now]<=ind[i]&&ind[i]<=ind[now]+sz[now]-1) {
                    if (t1&&ind[v]<=ind[i]&&ind[i]<=ind[v]+sz[v]-1) {
                        continue;
                    }
                    if (dep[i]<=dep[now]+b) {
                        ret=min(ret,i);
                    }
                }
            }
        }
        //printf("%d %d %d %d\n",v,t1,t,ret);
        return dp[v][t1][t]=ret;
    }
    for(int i=1;i<=n;i++) {
        dist[i]=-1;
    }
    while (!q.empty()) {
        q.pop();
    }
    q.push(v);
    dist[v]=0;
    while (!q.empty()) {
        int vv=q.front();
        q.pop();
        for(int i=0;i<adj[vv].size();i++) {
            int nt=adj[vv][i];
            if (dist[nt]==-1) {
                dist[nt]=dist[vv]+1;
                q.push(nt);
            }
        }
    }
    vector<int> vec;
    for(int i=1;i<=n;i++) {
        if (dist[i]<=b) {
            vec.push_back(i);
        }
    }
    int ret=n;
    for(int i:vec) {
        if (i!=v&&ind[i]<=ind[v]&&ind[v]<=ind[i]+sz[i]-1) {
            int diff=dep[v]-dep[i];
            ret=min(ret,ans(par[v][diff-1],1,0));
        }
        else {
            ret=min(ret,ans(i,0,0));
        }
    }
    //printf("%d %d %d %d\n",v,t1,t,ret);
    return dp[v][t1][t]=ret;
}

int main(void) {
    scanf("%d %d %d %d",&n,&r,&a,&b);
    if (a<=b) {
        printf("1");
        return 0;
    }
    for(int i=1;i<n;i++) {
        int u,v;
        scanf("%d %d",&u,&v);
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    dfs(r,-1);
    for(int i=1;i<=n;i++) {
        int now=i;
        int cnt=0;
        while (now!=-1) {
            par[i][cnt]=now;
            cnt++;
            now=p[now];
        }
    }
    memset(dp,-1,sizeof(dp));
    printf("%d",ans(r,0,0));
}

Compilation message

Main.cpp: In function 'void dfs(int, int)':
Main.cpp:20:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |     for(int i=0;i<adj[v].size();i++) {
      |                 ~^~~~~~~~~~~~~~
Main.cpp: In function 'int ans(int, int, int)':
Main.cpp:79:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |         for(int i=0;i<adj[vv].size();i++) {
      |                     ~^~~~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:108:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  108 |     scanf("%d %d %d %d",&n,&r,&a,&b);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:115:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  115 |         scanf("%d %d",&u,&v);
      |         ~~~~~^~~~~~~~~~~~~~~

Subtask #1
1.0 / 1.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct

Subtask #2
0.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 1 ms 604 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #3
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 3164 KB Output is correct
2 Correct 2 ms 1628 KB Output is correct
3 Correct 1 ms 1628 KB Output is correct
4 Correct 2 ms 1832 KB Output is correct
5 Correct 1 ms 1628 KB Output is correct
6 Correct 2 ms 3172 KB Output is correct
7 Correct 2 ms 1624 KB Output is correct
8 Correct 1 ms 1628 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 1628 KB Output is correct
11 Correct 2 ms 3164 KB Output is correct
12 Correct 0 ms 604 KB Output is correct
13 Correct 0 ms 604 KB Output is correct

Subtask #4
3.0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 3164 KB Output is correct
2 Correct 2 ms 1628 KB Output is correct
3 Correct 1 ms 1628 KB Output is correct
4 Correct 2 ms 1832 KB Output is correct
5 Correct 1 ms 1628 KB Output is correct
6 Correct 2 ms 3172 KB Output is correct
7 Correct 2 ms 1624 KB Output is correct
8 Correct 1 ms 1628 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 1628 KB Output is correct
11 Correct 2 ms 3164 KB Output is correct
12 Correct 0 ms 604 KB Output is correct
13 Correct 0 ms 604 KB Output is correct
14 Correct 105 ms 14172 KB Output is correct
15 Correct 116 ms 14428 KB Output is correct
16 Correct 96 ms 14168 KB Output is correct
17 Correct 127 ms 14428 KB Output is correct
18 Correct 91 ms 14424 KB Output is correct
19 Correct 101 ms 14424 KB Output is correct
20 Correct 114 ms 14568 KB Output is correct
21 Correct 4 ms 14168 KB Output is correct
22 Correct 0 ms 344 KB Output is correct
23 Correct 84 ms 13896 KB Output is correct
24 Correct 124 ms 16216 KB Output is correct
25 Correct 136 ms 16216 KB Output is correct
26 Correct 7 ms 15888 KB Output is correct
27 Correct 4 ms 14172 KB Output is correct
28 Correct 4 ms 14172 KB Output is correct
29 Correct 4 ms 14172 KB Output is correct
30 Correct 155 ms 14228 KB Output is correct
31 Correct 155 ms 14132 KB Output is correct
32 Correct 152 ms 14168 KB Output is correct
33 Correct 147 ms 29788 KB Output is correct

Subtask #5
0.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 1 ms 600 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #6
0.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 3164 KB Output is correct
2 Correct 2 ms 1628 KB Output is correct
3 Correct 1 ms 1628 KB Output is correct
4 Correct 2 ms 1832 KB Output is correct
5 Correct 1 ms 1628 KB Output is correct
6 Correct 2 ms 3172 KB Output is correct
7 Correct 2 ms 1624 KB Output is correct
8 Correct 1 ms 1628 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 1628 KB Output is correct
11 Correct 2 ms 3164 KB Output is correct
12 Correct 0 ms 604 KB Output is correct
13 Correct 0 ms 604 KB Output is correct
14 Correct 105 ms 14172 KB Output is correct
15 Correct 116 ms 14428 KB Output is correct
16 Correct 96 ms 14168 KB Output is correct
17 Correct 127 ms 14428 KB Output is correct
18 Correct 91 ms 14424 KB Output is correct
19 Correct 101 ms 14424 KB Output is correct
20 Correct 114 ms 14568 KB Output is correct
21 Correct 4 ms 14168 KB Output is correct
22 Correct 0 ms 344 KB Output is correct
23 Correct 84 ms 13896 KB Output is correct
24 Correct 124 ms 16216 KB Output is correct
25 Correct 136 ms 16216 KB Output is correct
26 Correct 7 ms 15888 KB Output is correct
27 Correct 4 ms 14172 KB Output is correct
28 Correct 4 ms 14172 KB Output is correct
29 Correct 4 ms 14172 KB Output is correct
30 Correct 155 ms 14228 KB Output is correct
31 Correct 155 ms 14132 KB Output is correct
32 Correct 152 ms 14168 KB Output is correct
33 Correct 147 ms 29788 KB Output is correct
34 Runtime error 1 ms 604 KB Execution killed with signal 11
35 Halted 0 ms 0 KB -

Subtask #7
0.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Runtime error 1 ms 604 KB Execution killed with signal 11
7 Halted 0 ms 0 KB -