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Submission #47246

# Submission time Handle Problem Language Result Execution time Memory
47246 2018-04-29T15:31:19 Z PowerOfNinjaGo Cities (BOI16_cities) C++17
100 / 100
 2934 ms 70620 KB 
//Power Of Ninja Go
#include <bits/stdc++.h>
//#ifdef atom #else #endif
using namespace std;
typedef long long ll; typedef pair<int, int> ii; typedef vector<int> vi; typedef vector< ii > vii;
#define X first
#define Y second
#define pb push_back
const int maxn = 1e5+5;
vii adj[maxn];
ll dp[32][maxn];
int main()
{
    int n, k, m; scanf("%d %d %d", &n, &k, &m);
    vi imp; imp.resize(k);
    for(int i = 0; i< k; i++) scanf("%d", &imp[i]);
    for(int i = 0; i< m; i++)
    {
        int u, v, w; scanf("%d %d %d", &u, &v, &w);
        adj[u].pb(ii(v, w));
        adj[v].pb(ii(u, w));
    }
    for(int a = 0; a< 32; a++)
    {
        for(int u = 1; u<= n; u++) dp[a][u] = 4e18;
    }
    for(int i = 0; i< k; i++)
    {
        dp[1<<i][imp[i]] = 0;
    }
    for(int bit = 1; bit< (1<<k); bit++)
    {
        for(int part = 0; part< bit; part++)
        {
            if((part | bit) != bit) continue;
            int rem = bit-part;
            for(int u = 1; u<= n; u++)
                dp[bit][u] = min(dp[bit][u], dp[part][u]+dp[rem][u]);
        }
        priority_queue< pair<ll, int> > pq;
        for(int i = 1; i<= n; i++)
        {
            if(dp[bit][i] != 4e18)
            {
                pq.push(make_pair(-dp[bit][i], i));
            }
        }
        while(!pq.empty())
        {
            ll w = -pq.top().X;
            int u = pq.top().Y;
            pq.pop();
            if(dp[bit][u] != w) continue;
            for(auto edge : adj[u])
            {
                int v = edge.X, w = edge.Y;
                if(dp[bit][v]> dp[bit][u]+w)
                {
                    dp[bit][v] = dp[bit][u]+w;
                    pq.push(make_pair(-dp[bit][v], v));
                }
            }
        }
    }
    ll res = 4e18;
    for(int i = 1; i<= n; i++) res = min(res, dp[(1<<k)-1][i]);
    cout << res << endl;
}

Compilation message

cities.cpp: In function 'int main()':
cities.cpp:14:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     int n, k, m; scanf("%d %d %d", &n, &k, &m);
                  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
cities.cpp:16:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i = 0; i< k; i++) scanf("%d", &imp[i]);
                               ~~~~~^~~~~~~~~~~~~~~
cities.cpp:19:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         int u, v, w; scanf("%d %d %d", &u, &v, &w);
                      ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2808 KB Output is correct
2 Correct 4 ms 2920 KB Output is correct
3 Correct 4 ms 2988 KB Output is correct
4 Correct 4 ms 2988 KB Output is correct
5 Correct 4 ms 2988 KB Output is correct

Subtask #2
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 711 ms 40736 KB Output is correct
2 Correct 663 ms 40736 KB Output is correct
3 Correct 415 ms 40736 KB Output is correct
4 Correct 98 ms 40736 KB Output is correct
5 Correct 392 ms 40736 KB Output is correct
6 Correct 96 ms 40736 KB Output is correct
7 Correct 7 ms 40736 KB Output is correct
8 Correct 6 ms 40736 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 40736 KB Output is correct
2 Correct 10 ms 40736 KB Output is correct
3 Correct 8 ms 40736 KB Output is correct
4 Correct 8 ms 40736 KB Output is correct

Subtask #4
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1436 ms 44616 KB Output is correct
2 Correct 1389 ms 48748 KB Output is correct
3 Correct 972 ms 48748 KB Output is correct
4 Correct 825 ms 48748 KB Output is correct
5 Correct 234 ms 48748 KB Output is correct
6 Correct 123 ms 48748 KB Output is correct

Subtask #5
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 2785 ms 62400 KB Output is correct
2 Correct 2934 ms 66572 KB Output is correct
3 Correct 2760 ms 70620 KB Output is correct
4 Correct 2020 ms 70620 KB Output is correct
5 Correct 1473 ms 70620 KB Output is correct
6 Correct 323 ms 70620 KB Output is correct
7 Correct 113 ms 70620 KB Output is correct