oj.uz

Submission #84239

# Submission time Handle Problem Language Result Execution time Memory
84239 2018-11-14T02:52:04 Z Vinhspm Cities (BOI16_cities) C++14
74 / 100
 6000 ms 235512 KB 
#include<bits/stdc++.h>
using namespace std;

#define fi first
#define se second
#define FOR(a, b, c) for(int a = b; a <= c; ++a)
#define int long long
#define pb push_back

const int N = 1e5 + 10;
const int oo = 1e18;
typedef pair<int, int> ii;
typedef pair<int, ii> pii;

int n, k, m;
int f[N][(1 << 5)], pos[N];
vector<ii> vi[N];

void upd(int &x, int y) { x = min(x, y); }
void solve()   {
    FOR(i, 1, n)    FOR(j, 0, (1 << k) - 1) f[i][j] = oo;
    priority_queue<pii, vector<pii>, greater<pii> > pq;
    FOR(i, 1, n) {
        int mask = 0; if(pos[i]) mask  = (1 << (pos[i] - 1));
        f[i][mask] = 0;
        pq.push(pii(0, ii(i, mask)));
    }
    while(!pq.empty())  {
        int u = pq.top().se.fi, mask = pq.top().se.se, val = pq.top().fi; pq.pop();
        //cout << u << ' ' << mask << '\n';
        if(f[u][mask] != val) continue;
        for(auto v: vi[u])  {
            for(int t = 0; t < (1 << k); ++t) if(!(mask & t))   {
                int nex = (mask | t);
                if(f[v.fi][nex] > f[u][mask] + v.se + f[v.fi][t]) {
                    f[v.fi][nex] = f[u][mask] + v.se + f[v.fi][t];
                    pq.push(pii(f[v.fi][nex], ii(v.fi, nex)));
                }
            }
        }
    }
}

signed main()
{
    //freopen("test.inp", "r", stdin);
    scanf("%lld%lld%lld", &n, &k, &m);
    FOR(i, 1, k) {
        int x; scanf("%lld", &x);
        pos[x] = i;
    }
    FOR(i, 1, m)    {
        int u, v, c; scanf("%lld%lld%lld", &u, &v, &c);
        vi[u].pb(ii(v, c)); vi[v].pb(ii(u, c));
    }
    solve();

    int ans = oo;
    FOR(i, 1, n) upd(ans, f[i][(1 << k) - 1]);
    printf("%lld", ans);
}

Compilation message

cities.cpp: In function 'int main()':
cities.cpp:47:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld%lld%lld", &n, &k, &m);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
cities.cpp:49:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         int x; scanf("%lld", &x);
                ~~~~~^~~~~~~~~~~~
cities.cpp:53:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         int u, v, c; scanf("%lld%lld%lld", &u, &v, &c);
                      ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2680 KB Output is correct
2 Correct 4 ms 2856 KB Output is correct
3 Correct 4 ms 2960 KB Output is correct
4 Correct 4 ms 2960 KB Output is correct
5 Correct 4 ms 3056 KB Output is correct

Subtask #2
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1594 ms 63104 KB Output is correct
2 Correct 1460 ms 63104 KB Output is correct
3 Correct 654 ms 63104 KB Output is correct
4 Correct 180 ms 63104 KB Output is correct
5 Correct 679 ms 63104 KB Output is correct
6 Correct 126 ms 63104 KB Output is correct
7 Correct 10 ms 63104 KB Output is correct
8 Correct 7 ms 63104 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 63104 KB Output is correct
2 Correct 17 ms 63104 KB Output is correct
3 Correct 10 ms 63104 KB Output is correct
4 Correct 15 ms 63104 KB Output is correct

Subtask #4
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 4826 ms 137092 KB Output is correct
2 Correct 4318 ms 137092 KB Output is correct
3 Correct 2264 ms 137092 KB Output is correct
4 Correct 3200 ms 137092 KB Output is correct
5 Correct 721 ms 137092 KB Output is correct
6 Correct 300 ms 137092 KB Output is correct

Subtask #5
0 / 26.0

# Verdict Execution time Memory Grader output
1 Execution timed out 6090 ms 235512 KB Time limit exceeded
2 Halted 0 ms 0 KB -