oj.uz

답안 #208587

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
208587 2020-03-11T17:42:29 Z DodgeBallMan Cities (BOI16_cities) C++14
74 / 100
 6000 ms 235672 KB 
#include <bits/stdc++.h>
#define pii pair<long long, long long>
#define x first
#define y second

using namespace std;

const int N = 1e5 + 2;
vector<pii> g[N];
vector<int> bit[10];
long long d[N][1<<5], ans = 1e18;
int n, k, m, id[N];
int main()
{
    memset( id, -1, sizeof id );
    fill_n( d[0], N*(1<<5), ans );
    scanf("%d %d %d",&n,&k,&m);
    for( int i = 0, a ; i < k ; i++ ) {
        scanf("%d",&a);
        id[a] = i;
    }
    for( int i = 0, a, b ; i < m ; i++ ) {
        long long d;
        scanf("%d %d %lld",&a,&b,&d);
        g[a].emplace_back( pii( b, d ) ), g[b].emplace_back( pii( a, d ));
    }
    for( int i = 1 ; i < ( 1 << k ) ; i++ ){
        bit[__builtin_popcount( i )].emplace_back( i );
    }
    for( int b = 1 ; b <= k ; b++ ) {
        priority_queue<pair<long long, pii>> q;
        if( b == 1 ) {
            for( int i = 1 ; i <= n ; i++ ) if( id[i] != -1 ) q.emplace( d[i][(1<<id[i])] = 0, make_pair( i, (1<<id[i] ) ) );
        }
        else {
            for( int i = 1 ; i <= n ; i++ ) for( int x : bit[b] ) {
                for( int j = 0 ; j < ( 1 << k ) ; j++ ) {
                    if( ( x & j ) != j ) continue ;
                    d[i][x] = min( d[i][x], d[i][j] + d[i][x^j] );
                    q.emplace( -1*d[i][x], make_pair( i, x ) );
                }
            }
        }
        while( !q.empty() ) {
            auto now = q.top(); q.pop();
            if( d[now.y.x][now.y.y] != -now.x ) continue;
            long  long di = -now.x;
            int u = now.y.x, bi = now.y.y;
            for( pii v : g[u] ) if( d[v.x][bi] > di + v.y ) {
                d[v.x][bi] = di + v.y;
                q.emplace( -1*d[v.x][bi], pii( v.x, bi ) );
            }
        }
    }
    for( int i = 1 ; i <= n ; i++ ) ans = min( ans, d[i][(1<<k)-1] );
    printf("%lld",ans);
    return 0;
}

Compilation message

cities.cpp: In function 'int main()':
cities.cpp:17:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d %d",&n,&k,&m);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~
cities.cpp:19:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&a);
         ~~~~~^~~~~~~~~
cities.cpp:24:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d %lld",&a,&b,&d);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 17 ms 28152 KB Output is correct
2 Correct 17 ms 28152 KB Output is correct
3 Correct 18 ms 28280 KB Output is correct
4 Correct 18 ms 28152 KB Output is correct
5 Correct 17 ms 28152 KB Output is correct

Subtask #2
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1503 ms 87932 KB Output is correct
2 Correct 1491 ms 87008 KB Output is correct
3 Correct 1086 ms 82864 KB Output is correct
4 Correct 123 ms 37552 KB Output is correct
5 Correct 571 ms 50896 KB Output is correct
6 Correct 112 ms 37316 KB Output is correct
7 Correct 24 ms 28724 KB Output is correct
8 Correct 20 ms 28536 KB Output is correct

Subtask #3
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 38 ms 29700 KB Output is correct
2 Correct 38 ms 29816 KB Output is correct
3 Correct 36 ms 29612 KB Output is correct
4 Correct 28 ms 28992 KB Output is correct

Subtask #4
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4639 ms 137340 KB Output is correct
2 Correct 4551 ms 136316 KB Output is correct
3 Correct 3887 ms 131960 KB Output is correct
4 Correct 2281 ms 112324 KB Output is correct
5 Correct 459 ms 57104 KB Output is correct
6 Correct 137 ms 40468 KB Output is correct

Subtask #5
0 / 26.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 6070 ms 235672 KB Time limit exceeded
2 Halted 0 ms 0 KB -