oj.uz

답안 #888927

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
888927 2023-12-18T12:00:04 Z hariaakas646 Olympic Bus (JOI20_ho_t4) C++17
100 / 100
 415 ms 5136 KB 
#include <bits/stdc++.h>

using namespace std;

#define scd(t) scanf("%d", &t)
#define sclld(t) scanf("%lld", &t)
#define forr(i, j, k) for (int i = j; i < k; i++)
#define frange(i, j) forr(i, 0, j)
#define all(cont) cont.begin(), cont.end()
#define mp make_pair
#define pb push_back
#define f first
#define s second
typedef long long int lli;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<lli> vll;
typedef vector<string> vs;
typedef vector<pii> vii;
typedef vector<vi> vvi;
typedef map<int, int> mpii;
typedef set<int> seti;
typedef multiset<int> mseti;
typedef long double ld;


void usaco()
{
    freopen("/media/hariaakash646/785EF1075EF0BF46/CompetitiveProgramming/input.in", "r", stdin);
//    freopen("problem.out", "w", stdout);
}

struct Edge {
    int u, v, c, d;
};

int main() {
    // usaco();
    int n, m;
    scd(n);
    scd(m);

    vector<Edge> vec(m);

    vector<seti> graph(n+1);

    vector<vll> dist(n+1, vll(n+1, 1e17));

    forr(i, 1, n+1) dist[i][i] = 0;

    frange(i, m) {
        int u, v, c, d;
        scd(u);
        scd(v);
        scd(c);
        scd(d);
        vec[i].u = u;
        vec[i].v = v;
        vec[i].c = c;
        vec[i].d = d;

        dist[u][v] = min(dist[u][v], (lli)c);
        graph[u].insert(i);
    }

    forr(k, 1, n+1) {
        forr(i, 1, n+1) {
            forr(j, 1, n+1) {
                dist[i][j] = min(dist[i][j], dist[i][k] + dist[k][j]);
            }
        }
    }

    // vb inpath(m);

    // queue<pii> q;
    // q.push(mp(1, -10));
    // vi par(n+1, -1);
    // if(dist[1][n] < 1e16)
    // {
    //     while(q.size()) {
    //         auto p = q.front();
    //         q.pop();
    //         if(par[p.f] != -1) continue;
    //         par[p.f] = p.s;

    //         if(p.f == n) {
    //             int curr = n;
    //             while(curr != 1) {
    //                 // printf("%d ", curr);
    //                 inpath[par[curr]] = true;
    //                 curr = vec[par[curr]].u;
    //             }
    //         }

    //         for(auto e : graph[p.f]) {
    //             if(dist[1][vec[e].u] + vec[e].c + dist[vec[e].v][n] == dist[1][n]) {
    //                 q.push(mp(vec[e].v, e));
    //             }
    //         }
    //     }
        
    // }

    lli mi = dist[1][n] + dist[n][1];

    // frange(i, m) {
    //     auto p = vec[i];
    //     lli v = dist[n][p.v] + dist[p.u][1] + p.c + p.d;

    //     if(v + dist[1][n] < mi) {
    //         graph[p.u].erase(i);
    //         graph[p.v].insert(i);

    //         swap(vec[i].u, vec[i].v);
    
    //         vll dist2(n+1, 1e16);
    //         priority_queue<pair<lli, int>> pq;
    //         pq.push(mp(0, 1));
    //         dist2[1] = 0;
    //         vb vis(n+1);
    //         while(pq.size()) {
    //             auto p = pq.top();
    //             pq.pop();
    
    //             if(vis[p.s]) continue;
    //             vis[p.s] = true;
    
    //             for(auto j : graph[p.s]) {
    //                 auto e = vec[j];
    //                 if(dist2[p.s] + e.c < dist2[e.v]) {
    //                     dist2[e.v] = dist2[p.s] + e.c;
    //                     pq.push(mp(-dist2[e.v], e.v));
    //                 }
    //             }
    //         }
    //         v += dist2[n];
    //         graph[p.v].erase(i);
    //         graph[p.u].insert(i);
    //         mi = min(mi, v);
    //         swap(vec[i].u, vec[i].v);
    //     }
    //     // else {
    //     //     v += dist[1][n];
    //     // }
    //     // mi = min(mi, v);
    // }

    // inpath = vb(m);

    // q = {};
    // q.push(mp(n, -10));
    // par = vi(n+1, -1);
    // if(dist[n][1] < 1e16)
    // {
    //     while(q.size()) {
    //         auto p = q.front();
    //         q.pop();
    //         if(par[p.f] != -1) continue;
    //         par[p.f] = p.s;

    //         if(p.f == 1) {
    //             int curr = 1;
    //             while(curr != n) {
    //                 // printf("%d ", curr);
    //                 inpath[par[curr]] = true;
    //                 curr = vec[par[curr]].u;
    //             }
    //         }

    //         for(auto e : graph[p.f]) {
    //             if(dist[n][vec[e].u] + vec[e].c + dist[vec[e].v][1] == dist[n][1]) {
    //                 q.push(mp(vec[e].v, e));
    //             }
    //         }
    //     }
        
    // }

    frange(i, m) {
        auto p = vec[i];
        // lli v = min(dist[1][n], dist[1][p.v] + dist[p.u][n] + p.c) + p.d;

        lli d1 = min(dist[1][n], dist[1][p.v] + dist[p.u][n] + p.c);
        lli d2 = min(dist[n][1], dist[n][p.v] + dist[p.u][1] + p.c);

        if(d1 + d2 + p.d < mi) {
            lli v = p.d;
            graph[p.u].erase(i);
            graph[p.v].insert(i);

            swap(vec[i].u, vec[i].v);
    
            vll dist2(n+1, 1e16);
            priority_queue<pair<lli, int>> pq;
            pq.push(mp(0, n));
            dist2[n] = 0;
            vb vis(n+1);
            while(pq.size()) {
                auto p = pq.top();
                pq.pop();
    
                if(vis[p.s]) continue;
                vis[p.s] = true;
    
                for(auto j : graph[p.s]) {
                    auto e = vec[j];
                    if(dist2[p.s] + e.c < dist2[e.v]) {
                        dist2[e.v] = dist2[p.s] + e.c;
                        pq.push(mp(-dist2[e.v], e.v));
                    }
                }
            }
            v += dist2[1];

            dist2 = vll(n+1, 1e16);
            pq.push(mp(0, 1));
            dist2[1] = 0;
            vis=vb(n+1);
            while(pq.size()) {
                auto p = pq.top();
                pq.pop();
    
                if(vis[p.s]) continue;
                vis[p.s] = true;
    
                for(auto j : graph[p.s]) {
                    auto e = vec[j];
                    if(dist2[p.s] + e.c < dist2[e.v]) {
                        dist2[e.v] = dist2[p.s] + e.c;
                        pq.push(mp(-dist2[e.v], e.v));
                    }
                }
            }
            v += dist2[n];

            graph[p.v].erase(i);
            graph[p.u].insert(i);
            mi = min(mi, v);
            swap(vec[i].u, vec[i].v);
        }
        // else {
        //     v += dist[n][1];
        // }
        // mi = min(mi, v);
    }

    // frange(i, m) {
    //     auto p = vec[i];
    //     lli v = dist[1][p.v] + dist[p.u][n] + p.c + p.d + dist[n][p.v] + dist[p.u][1] + p.c;
    //     mi = min(mi, v);
    // }

    if(mi < 1e16) printf("%lld", mi);
    else printf("-1");

}

Compilation message

ho_t4.cpp: In function 'void usaco()':
ho_t4.cpp:30:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |     freopen("/media/hariaakash646/785EF1075EF0BF46/CompetitiveProgramming/input.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ho_t4.cpp: In function 'int main()':
ho_t4.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
ho_t4.cpp:41:5: note: in expansion of macro 'scd'
   41 |     scd(n);
      |     ^~~
ho_t4.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
ho_t4.cpp:42:5: note: in expansion of macro 'scd'
   42 |     scd(m);
      |     ^~~
ho_t4.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
ho_t4.cpp:54:9: note: in expansion of macro 'scd'
   54 |         scd(u);
      |         ^~~
ho_t4.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
ho_t4.cpp:55:9: note: in expansion of macro 'scd'
   55 |         scd(v);
      |         ^~~
ho_t4.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
ho_t4.cpp:56:9: note: in expansion of macro 'scd'
   56 |         scd(c);
      |         ^~~
ho_t4.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
ho_t4.cpp:57:9: note: in expansion of macro 'scd'
   57 |         scd(d);
      |         ^~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 604 KB Output is correct
2 Correct 7 ms 784 KB Output is correct
3 Correct 7 ms 604 KB Output is correct
4 Correct 7 ms 760 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 7 ms 780 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 10 ms 820 KB Output is correct
11 Correct 20 ms 604 KB Output is correct
12 Correct 8 ms 828 KB Output is correct
13 Correct 8 ms 600 KB Output is correct
14 Correct 7 ms 604 KB Output is correct
15 Correct 7 ms 860 KB Output is correct
16 Correct 8 ms 860 KB Output is correct

Subtask #2
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 28 ms 3676 KB Output is correct
2 Correct 30 ms 3676 KB Output is correct
3 Correct 29 ms 3676 KB Output is correct
4 Correct 8 ms 860 KB Output is correct
5 Correct 7 ms 824 KB Output is correct
6 Correct 7 ms 796 KB Output is correct
7 Correct 7 ms 600 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 47 ms 3756 KB Output is correct
10 Correct 37 ms 3932 KB Output is correct
11 Correct 31 ms 3672 KB Output is correct
12 Correct 31 ms 3676 KB Output is correct
13 Correct 30 ms 3932 KB Output is correct
14 Correct 31 ms 3820 KB Output is correct

Subtask #3
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 604 KB Output is correct
2 Correct 7 ms 784 KB Output is correct
3 Correct 25 ms 3004 KB Output is correct
4 Correct 7 ms 604 KB Output is correct
5 Correct 34 ms 3888 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 52 ms 3736 KB Output is correct
9 Correct 55 ms 4700 KB Output is correct
10 Correct 37 ms 4684 KB Output is correct
11 Correct 32 ms 4956 KB Output is correct
12 Correct 33 ms 4620 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 600 KB Output is correct
16 Correct 0 ms 440 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 40 ms 5136 KB Output is correct
20 Correct 33 ms 4688 KB Output is correct
21 Correct 32 ms 4696 KB Output is correct
22 Correct 32 ms 4728 KB Output is correct

Subtask #4
63.0 / 63.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 604 KB Output is correct
2 Correct 7 ms 784 KB Output is correct
3 Correct 7 ms 604 KB Output is correct
4 Correct 7 ms 760 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 7 ms 780 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 10 ms 820 KB Output is correct
11 Correct 20 ms 604 KB Output is correct
12 Correct 8 ms 828 KB Output is correct
13 Correct 8 ms 600 KB Output is correct
14 Correct 7 ms 604 KB Output is correct
15 Correct 7 ms 860 KB Output is correct
16 Correct 8 ms 860 KB Output is correct
17 Correct 28 ms 3676 KB Output is correct
18 Correct 30 ms 3676 KB Output is correct
19 Correct 29 ms 3676 KB Output is correct
20 Correct 8 ms 860 KB Output is correct
21 Correct 7 ms 824 KB Output is correct
22 Correct 7 ms 796 KB Output is correct
23 Correct 7 ms 600 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 47 ms 3756 KB Output is correct
26 Correct 37 ms 3932 KB Output is correct
27 Correct 31 ms 3672 KB Output is correct
28 Correct 31 ms 3676 KB Output is correct
29 Correct 30 ms 3932 KB Output is correct
30 Correct 31 ms 3820 KB Output is correct
31 Correct 8 ms 604 KB Output is correct
32 Correct 7 ms 784 KB Output is correct
33 Correct 25 ms 3004 KB Output is correct
34 Correct 7 ms 604 KB Output is correct
35 Correct 34 ms 3888 KB Output is correct
36 Correct 0 ms 344 KB Output is correct
37 Correct 1 ms 348 KB Output is correct
38 Correct 52 ms 3736 KB Output is correct
39 Correct 55 ms 4700 KB Output is correct
40 Correct 37 ms 4684 KB Output is correct
41 Correct 32 ms 4956 KB Output is correct
42 Correct 33 ms 4620 KB Output is correct
43 Correct 1 ms 348 KB Output is correct
44 Correct 0 ms 348 KB Output is correct
45 Correct 0 ms 600 KB Output is correct
46 Correct 0 ms 440 KB Output is correct
47 Correct 0 ms 348 KB Output is correct
48 Correct 0 ms 348 KB Output is correct
49 Correct 40 ms 5136 KB Output is correct
50 Correct 33 ms 4688 KB Output is correct
51 Correct 32 ms 4696 KB Output is correct
52 Correct 32 ms 4728 KB Output is correct
53 Correct 30 ms 4700 KB Output is correct
54 Correct 30 ms 4764 KB Output is correct
55 Correct 30 ms 4688 KB Output is correct
56 Correct 7 ms 600 KB Output is correct
57 Correct 7 ms 604 KB Output is correct
58 Correct 33 ms 4108 KB Output is correct
59 Correct 32 ms 3924 KB Output is correct
60 Correct 35 ms 3992 KB Output is correct
61 Correct 35 ms 3928 KB Output is correct
62 Correct 137 ms 3932 KB Output is correct
63 Correct 290 ms 3928 KB Output is correct
64 Correct 87 ms 4496 KB Output is correct
65 Correct 223 ms 4524 KB Output is correct
66 Correct 415 ms 4492 KB Output is correct
67 Correct 23 ms 3676 KB Output is correct
68 Correct 46 ms 4956 KB Output is correct
69 Correct 41 ms 4956 KB Output is correct
70 Correct 32 ms 4948 KB Output is correct
71 Correct 34 ms 4948 KB Output is correct
72 Correct 32 ms 4944 KB Output is correct
73 Correct 32 ms 4956 KB Output is correct
74 Correct 34 ms 5048 KB Output is correct