oj.uz

Submission #239553

# Submission time Handle Problem Language Result Execution time Memory
239553 2020-06-16T10:02:22 Z Vimmer Ceste (COCI17_ceste) C++14
160 / 160
 546 ms 760 KB 
#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("fast-math")
//#pragma GCC optimize("no-stack-protector")

#define F first
#define S second
#define sz(x) int(x.size())
#define pb push_back
#define N 101001
#define M ll(1e9 + 7)
#define inf 1e9 + 1e9


using namespace std;
//using namespace __gnu_pbds;

typedef long double ld;
typedef long long ll;
typedef short int si;
typedef array <int, 3> a3;

//typedef tree <int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

const ld E = 1e-9;

vector <ll> g[2005];

ll A[2005], B[2005], T[2005], C[2005];

ll opr(ll i, ll b) {return (A[i] == b ? B[i] : A[i]);}

set <pair <ld, ll> > se;

ll ans[2005];

pair <ld, array <ll, 2> > dst[2005];

int main()
{
    //freopen("input.txt", "r", stdin); //freopen("output4.txt", "w", stdout);

    ios_base::sync_with_stdio(0); istream::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    int n, m;

    cin >> n >> m;

    for (int i = 0; i < m; i++)
    {
        cin >> A[i] >> B[i] >> T[i] >> C[i];

        A[i]--; B[i]--;

        g[A[i]].pb(i);

        g[B[i]].pb(i);
    }

    ld ca = 1, cb = 0;

    while (1)
    {
        for (int i = 1; i < n; i++) dst[i] = {1e18, {ll(1e9), ll(1e9)}};

        se.insert({0.0, 0});

        while (sz(se))
        {
            int v = (*se.begin()).S;

            se.erase(se.begin());

            for (auto i : g[v])
            {
                int nxt = opr(i, v);

                ld val = dst[v].F + ca * ld(T[i]) + cb * ld(C[i]);

                if (val + E < dst[nxt].F)
                {
                    se.erase({dst[nxt].F, nxt});

                    dst[nxt] = {val, {dst[v].S[0] + T[i], dst[v].S[1] + C[i]}};

                    se.insert({dst[nxt].F, nxt});
                }
            }
        }

        ld nw = 0;

        for (int v = 0; v < n; v++)
        {
            if (dst[v].F == 1e18) continue;

            if (ans[v] == 0 || ans[v] > dst[v].S[0] * dst[v].S[1]) ans[v] = dst[v].S[0] * dst[v].S[1];

            for (auto i : g[v])
            {
                int nxt = opr(i, v);

                ld difa = (dst[v].S[0] + T[i]) - dst[nxt].S[0], difb = (dst[v].S[1] + C[i]) - dst[nxt].S[1];

                if (difa == difb) continue;

                ld Z = difb / (difb - difa);

                if (Z + E < ca && Z - E> nw) nw = Z;
            }
        }

        if (nw + E >= ca) break;

        ca = nw;

        cb = 1.0 - ca;

    }

    for (int i = 1; i < n; i++) if (ans[i] == 0) cout << -1 << '\n'; else cout << ans[i] << '\n';
}

Subtask #1
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 384 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 102 ms 632 KB Output is correct
2 Correct 214 ms 596 KB Output is correct
3 Correct 51 ms 512 KB Output is correct

Subtask #6
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 512 KB Output is correct
2 Correct 25 ms 512 KB Output is correct
3 Correct 50 ms 512 KB Output is correct

Subtask #7
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 228 ms 688 KB Output is correct
2 Correct 257 ms 512 KB Output is correct
3 Correct 400 ms 760 KB Output is correct

Subtask #8
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 321 ms 760 KB Output is correct
2 Correct 546 ms 760 KB Output is correct
3 Correct 22 ms 640 KB Output is correct

Subtask #9
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 200 ms 640 KB Output is correct
2 Correct 268 ms 692 KB Output is correct
3 Correct 319 ms 640 KB Output is correct

Subtask #10
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 261 ms 640 KB Output is correct
2 Correct 307 ms 760 KB Output is correct
3 Correct 317 ms 696 KB Output is correct