oj.uz

답안 #90828

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
90828 2018-12-24T17:22:29 Z Vardanyan Triumphal arch (POI13_luk) C++14
0 / 100
 322 ms 32992 KB 
#include<bits/stdc++.h>

using namespace std;

const int N = 300*1000+5;
int depth[N];
vector<int> g[N];
void dfs(int v,int p = 0){
    depth[v] = depth[p]+1;
    for(int i = 0;i<g[v].size();i++){
        int to = g[v][i];
        if(to == p) continue;
        dfs(to,v);
    }
}
vector<int> all;
bool check(int crew){
    int tim = 1;
    int pos = 0;
    while(pos<all.size()){
        for(int i = 0;i<crew;i++){
            if(all[pos]<=tim) return false;
            pos++;
            if(pos>=all.size()) return true;
        }
        tim++;
    }
    return true;
}
int main()
{
    int n;
    scanf("%d",&n);
    for(int i = 1;i<=n-1;i++){
        int x,y;
        scanf("%d%d",&x,&y);
        g[x].push_back(y);
        g[y].push_back(x);
    }
    if(n == 1){
        printf("0\n");
        return 0;
    }
    dfs(1);
    for(int i = 2;i<=n;i++){
        all.push_back(depth[i]);
    }
    sort(all.begin(),all.end());
    int l = 1;
    int r = n;
    int ans = n-1;
    while(l<=r){
        int m = (l+r)/2;
        if(check(m)){
            ans = m;
            r = m-1;
        }
        else l = m+1;
    }
    printf("%d\n",ans);
    return 0;
}

Compilation message

luk.cpp: In function 'void dfs(int, int)':
luk.cpp:10:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0;i<g[v].size();i++){
                   ~^~~~~~~~~~~~
luk.cpp: In function 'bool check(int)':
luk.cpp:20:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(pos<all.size()){
           ~~~^~~~~~~~~~~
luk.cpp:24:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if(pos>=all.size()) return true;
                ~~~^~~~~~~~~~~~
luk.cpp: In function 'int main()':
luk.cpp:33:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
luk.cpp:36:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&x,&y);
         ~~~~~^~~~~~~~~~~~~~

Subtask #1
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 7416 KB Output is correct
2 Correct 7 ms 7496 KB Output is correct
3 Incorrect 7 ms 7560 KB Output isn't correct

Subtask #2
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 7 ms 7560 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 6 ms 7604 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 7 ms 7632 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 11 ms 8152 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 21 ms 9416 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 65 ms 13616 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 186 ms 20396 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 322 ms 29028 KB Output isn't correct

Subtask #10
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 316 ms 32992 KB Output isn't correct
2 Halted 0 ms 0 KB -