oj.uz

답안 #283083

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
283083 2020-08-25T09:42:48 Z infinite_iq Museum (CEOI17_museum) C++14
80 / 100
 158 ms 9984 KB 
#define fast ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0)
#include <bits/stdc++.h>
using namespace std;
#define sqr 340
#define mp make_pair
#define mid (l+r)/2
#define le node * 2 
#define ri node * 2 + 1 
#define pb push_back
#define ppb pop_back
#define fi first
#define se second
#define lb lower_bound
#define ub upper_bound
#define ins insert
#define era erase
#define C continue
#define mem(dp,i) memset(dp,i,sizeof(dp))
#define mset multiset
#define all(x) x.begin(), x.end()
#define gc getchar_unlocked
typedef long long ll;
typedef short int si;
typedef long double ld;
typedef pair<int,int> pi;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<pi> vpi;
typedef vector<pll> vpll;
typedef pair<double,ll>pdi;
const ll inf=1e18;
const ll mod=998244353;
const ld Pi=acos(-1) ;
int n , k , root ;
vpi v [10009] ;
int dp [10009][109][2] , sz [10009] ;
int Min ( int x , int y ) {
        x = ( x == -1 ? 1e9 : x ) ;
        return min ( x , y ) ;
}
void dfs ( int node , int p ) {
        sz [node] = 1 ;
        for ( auto U : v [node] ) {
                int u = U .fi ;
                if ( u == p ) C ;
                dfs ( u , node ) ;
                sz [node] += sz [u] ;
        }
        int crnt = 1 ;
        dp [node][1][0] = dp [node][1][1] = 0 ;
        for ( auto U : v [node] ) {
                int u = U .fi , cost = U .se ;
                if ( u == p ) C ;
                crnt += sz [u] ;
                for ( int i = min ( k , crnt ) ; i >= 2 ; i -- ) {
                        for ( int j = 1 ; j <= min ( i - 1 , sz [u] ) ; j ++ ) {
                                if (    dp [node][i-j][0] != -1 ) {
                                        dp [node][i][0] = Min ( dp [node][i][0] , dp [node][i-j][0] + dp [u][j][1] + cost * 2 ) ;
                                }
                                if (    dp [node][i-j][1] != -1 ) {
                                        dp [node][i][1] = Min ( dp [node][i][1] , dp [node][i-j][1] + dp [u][j][1] + cost * 2 ) ;
                                        dp [node][i][0] = Min ( dp [node][i][0] , dp [node][i-j][1] + dp [u][j][0] + cost ) ;
                                }
                        }
                }
        }
}
int main () {
        cin >> n >> k >> root ;
        root -- ;
        for ( int i = 0 ; i < n - 1 ; i ++ ) {
                int a , b , c ;
                scanf ("%d%d%d",&a ,&b ,&c ) ;
                a -- , b -- ;
                v [a] .pb ( { b , c } ) ;
                v [b] .pb ( { a , c } ) ;
        }
        for ( int i = 0 ; i < n ; i ++ ) {
                for ( int j = 1 ; j <= k ; j ++ ) {
                        dp [i][j][0] = dp [i][j][1] = -1 ;
                }
        }
        dfs ( root , root ) ;
        cout << min ( dp [root][k][0] , dp [root][k][1] ) << endl ;
}

Compilation message

museum.cpp: In function 'int main()':
museum.cpp:74:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   74 |                 scanf ("%d%d%d",&a ,&b ,&c ) ;
      |                 ~~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 640 KB Output is correct
2 Correct 1 ms 512 KB Output is correct
3 Correct 1 ms 512 KB Output is correct
4 Correct 1 ms 512 KB Output is correct
5 Correct 1 ms 512 KB Output is correct

Subtask #2
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 27 ms 9720 KB Output is correct
2 Correct 27 ms 9728 KB Output is correct
3 Correct 67 ms 9984 KB Output is correct
4 Correct 48 ms 9728 KB Output is correct
5 Correct 35 ms 9720 KB Output is correct

Subtask #3
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 27 ms 9720 KB Output is correct
2 Correct 27 ms 9728 KB Output is correct
3 Correct 67 ms 9984 KB Output is correct
4 Correct 48 ms 9728 KB Output is correct
5 Correct 35 ms 9720 KB Output is correct
6 Correct 27 ms 9600 KB Output is correct
7 Correct 58 ms 9892 KB Output is correct
8 Correct 17 ms 9728 KB Output is correct
9 Correct 17 ms 9600 KB Output is correct
10 Correct 18 ms 9728 KB Output is correct

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 640 KB Output is correct
2 Correct 1 ms 512 KB Output is correct
3 Correct 1 ms 512 KB Output is correct
4 Correct 1 ms 512 KB Output is correct
5 Correct 1 ms 512 KB Output is correct
6 Correct 27 ms 9720 KB Output is correct
7 Correct 27 ms 9728 KB Output is correct
8 Correct 67 ms 9984 KB Output is correct
9 Correct 48 ms 9728 KB Output is correct
10 Correct 35 ms 9720 KB Output is correct
11 Correct 27 ms 9600 KB Output is correct
12 Correct 58 ms 9892 KB Output is correct
13 Correct 17 ms 9728 KB Output is correct
14 Correct 17 ms 9600 KB Output is correct
15 Correct 18 ms 9728 KB Output is correct
16 Incorrect 158 ms 9724 KB Output isn't correct
17 Halted 0 ms 0 KB -