oj.uz

답안 #393624

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
393624 2021-04-24T06:25:21 Z 79brue Olympic Bus (JOI20_ho_t4) C++14
100 / 100
 153 ms 8388 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

struct Edge{
    int u, v, idx; ll c, d;
    Edge(){}
    Edge(int u, int v, int idx, ll c, ll d): u(u), v(v), idx(idx), c(c), d(d){}

    bool operator==(const Edge &r)const{
        return idx == r.idx;
    }
};

int n, m;
vector<Edge> link[202];
vector<Edge> revLink[202];
Edge arr[50002];
ll ans = LLONG_MAX;

struct Dijkstra {
    int n;
    ll dist[202]; int prv[202], start, last;
    bool used[50002], chk[202];

    void init(int _n, int _start){
        n = _n, start = _start, last = n+1-start;
    }

    void run(){
        fill(dist+1, dist+n+1, 1e18);
        fill(chk+1, chk+n+1, false);
        fill(used+1, used+m+1, false);
        dist[start] = 0;

        while(1){
            int pnt = 0; ll pntD = 1e18;
            for(int i=1; i<=n; i++){
                if(!chk[i] && pntD > dist[i]) pntD = dist[i], pnt = i;
            }
            if(pnt == 0) break;

            chk[pnt] = 1;
            for(auto y: link[pnt]){
                int nxt = y.v;
                ll nxtCost = dist[pnt] + y.c;
                if(nxtCost < dist[nxt]){
                    dist[nxt] = nxtCost;
                    prv[nxt] = y.idx;
                }
            }
        }

        if(dist[last] == 1e18) return;
        int tmp = last;
        while(tmp != start){
            used[prv[tmp]] = 1;
            tmp = arr[prv[tmp]].u;
        }
    }
} dijk1, dijk2, dijktmp, dijk1rev, dijk2rev;

int main(){
    scanf("%d %d", &n, &m);
    for(int i=1; i<=m; i++){
        int u, v; ll c, d;
        scanf("%d %d %lld %lld", &u, &v, &c, &d);
        link[u].push_back(Edge(u, v, i, c, d));
        revLink[v].push_back(Edge(v, u, i, c, d));
        arr[i] = Edge(u, v, i, c, d);
    }

    dijk1.init(n, 1), dijk1rev.init(n, n), dijk2.init(n, n), dijk2rev.init(n, 1);
    dijk1.run(), dijk2.run();
    ans = dijk1.dist[n] + dijk2.dist[1];

    for(int i=1; i<=n; i++) revLink[i].swap(link[i]);
    for(int i=1; i<=m; i++) swap(arr[i].u, arr[i].v);
    dijk1rev.run();
    dijk2rev.run();
    for(int i=1; i<=n; i++) revLink[i].swap(link[i]);
    for(int i=1; i<=m; i++) swap(arr[i].u, arr[i].v);

    for(int i=1; i<=m; i++){
        ll ret = arr[i].d;
        if(!dijk1.used[i]) ret += min(dijk1.dist[n], dijk1.dist[arr[i].v] + dijk1rev.dist[arr[i].u] + arr[i].c);
        else{
            link[arr[i].u].erase(find(link[arr[i].u].begin(), link[arr[i].u].end(), arr[i]));
            swap(arr[i].u, arr[i].v);
            link[arr[i].u].push_back(arr[i]);

            dijktmp.init(n, 1);
            dijktmp.run();
            ret += dijktmp.dist[n];

            link[arr[i].u].erase(find(link[arr[i].u].begin(), link[arr[i].u].end(), arr[i]));
            swap(arr[i].u, arr[i].v);
            link[arr[i].u].push_back(arr[i]);
        }

        if(!dijk2.used[i]) ret += min(dijk2.dist[1], dijk2.dist[arr[i].v] + dijk2rev.dist[arr[i].u] + arr[i].c);
        else{
            link[arr[i].u].erase(find(link[arr[i].u].begin(), link[arr[i].u].end(), arr[i]));
            swap(arr[i].u, arr[i].v);
            link[arr[i].u].push_back(arr[i]);

            dijktmp.init(n, n);
            dijktmp.run();
            ret += dijktmp.dist[1];

            link[arr[i].u].erase(find(link[arr[i].u].begin(), link[arr[i].u].end(), arr[i]));
            swap(arr[i].u, arr[i].v);
            link[arr[i].u].push_back(arr[i]);
        }

        ans = min(ans, ret);
    }

    printf("%lld", ans > 1e17 ? -1 : ans);
}

Compilation message

ho_t4.cpp: In function 'int main()':
ho_t4.cpp:66:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   66 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
ho_t4.cpp:69:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   69 |         scanf("%d %d %lld %lld", &u, &v, &c, &d);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 460 KB Output is correct
2 Correct 1 ms 324 KB Output is correct
3 Correct 3 ms 460 KB Output is correct
4 Correct 5 ms 460 KB Output is correct
5 Correct 2 ms 460 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 312 KB Output is correct
8 Correct 1 ms 320 KB Output is correct
9 Correct 1 ms 460 KB Output is correct
10 Correct 50 ms 460 KB Output is correct
11 Correct 50 ms 496 KB Output is correct
12 Correct 50 ms 484 KB Output is correct
13 Correct 1 ms 460 KB Output is correct
14 Correct 3 ms 460 KB Output is correct
15 Correct 3 ms 460 KB Output is correct
16 Correct 3 ms 460 KB Output is correct

Subtask #2
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 32 ms 6856 KB Output is correct
2 Correct 30 ms 7916 KB Output is correct
3 Correct 39 ms 7996 KB Output is correct
4 Correct 4 ms 588 KB Output is correct
5 Correct 4 ms 460 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 38 ms 7960 KB Output is correct
10 Correct 28 ms 8004 KB Output is correct
11 Correct 31 ms 8260 KB Output is correct
12 Correct 31 ms 8296 KB Output is correct
13 Correct 31 ms 8004 KB Output is correct
14 Correct 38 ms 8388 KB Output is correct

Subtask #3
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 460 KB Output is correct
2 Correct 1 ms 320 KB Output is correct
3 Correct 21 ms 5948 KB Output is correct
4 Correct 1 ms 328 KB Output is correct
5 Correct 27 ms 7832 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 316 KB Output is correct
8 Correct 27 ms 7928 KB Output is correct
9 Correct 35 ms 8004 KB Output is correct
10 Correct 29 ms 7752 KB Output is correct
11 Correct 43 ms 7732 KB Output is correct
12 Correct 28 ms 8244 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 1 ms 332 KB Output is correct
18 Correct 1 ms 332 KB Output is correct
19 Correct 28 ms 8040 KB Output is correct
20 Correct 27 ms 7876 KB Output is correct
21 Correct 34 ms 7620 KB Output is correct
22 Correct 28 ms 7820 KB Output is correct

Subtask #4
63.0 / 63.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 460 KB Output is correct
2 Correct 1 ms 324 KB Output is correct
3 Correct 3 ms 460 KB Output is correct
4 Correct 5 ms 460 KB Output is correct
5 Correct 2 ms 460 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 312 KB Output is correct
8 Correct 1 ms 320 KB Output is correct
9 Correct 1 ms 460 KB Output is correct
10 Correct 50 ms 460 KB Output is correct
11 Correct 50 ms 496 KB Output is correct
12 Correct 50 ms 484 KB Output is correct
13 Correct 1 ms 460 KB Output is correct
14 Correct 3 ms 460 KB Output is correct
15 Correct 3 ms 460 KB Output is correct
16 Correct 3 ms 460 KB Output is correct
17 Correct 32 ms 6856 KB Output is correct
18 Correct 30 ms 7916 KB Output is correct
19 Correct 39 ms 7996 KB Output is correct
20 Correct 4 ms 588 KB Output is correct
21 Correct 4 ms 460 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 1 ms 332 KB Output is correct
24 Correct 1 ms 332 KB Output is correct
25 Correct 38 ms 7960 KB Output is correct
26 Correct 28 ms 8004 KB Output is correct
27 Correct 31 ms 8260 KB Output is correct
28 Correct 31 ms 8296 KB Output is correct
29 Correct 31 ms 8004 KB Output is correct
30 Correct 38 ms 8388 KB Output is correct
31 Correct 3 ms 460 KB Output is correct
32 Correct 1 ms 320 KB Output is correct
33 Correct 21 ms 5948 KB Output is correct
34 Correct 1 ms 328 KB Output is correct
35 Correct 27 ms 7832 KB Output is correct
36 Correct 1 ms 332 KB Output is correct
37 Correct 1 ms 316 KB Output is correct
38 Correct 27 ms 7928 KB Output is correct
39 Correct 35 ms 8004 KB Output is correct
40 Correct 29 ms 7752 KB Output is correct
41 Correct 43 ms 7732 KB Output is correct
42 Correct 28 ms 8244 KB Output is correct
43 Correct 1 ms 332 KB Output is correct
44 Correct 1 ms 332 KB Output is correct
45 Correct 1 ms 332 KB Output is correct
46 Correct 1 ms 332 KB Output is correct
47 Correct 1 ms 332 KB Output is correct
48 Correct 1 ms 332 KB Output is correct
49 Correct 28 ms 8040 KB Output is correct
50 Correct 27 ms 7876 KB Output is correct
51 Correct 34 ms 7620 KB Output is correct
52 Correct 28 ms 7820 KB Output is correct
53 Correct 29 ms 7760 KB Output is correct
54 Correct 37 ms 7696 KB Output is correct
55 Correct 29 ms 7668 KB Output is correct
56 Correct 3 ms 460 KB Output is correct
57 Correct 3 ms 460 KB Output is correct
58 Correct 106 ms 6140 KB Output is correct
59 Correct 109 ms 6220 KB Output is correct
60 Correct 112 ms 6252 KB Output is correct
61 Correct 90 ms 6136 KB Output is correct
62 Correct 107 ms 6120 KB Output is correct
63 Correct 109 ms 6184 KB Output is correct
64 Correct 153 ms 6564 KB Output is correct
65 Correct 142 ms 6596 KB Output is correct
66 Correct 131 ms 6644 KB Output is correct
67 Correct 21 ms 5428 KB Output is correct
68 Correct 29 ms 8188 KB Output is correct
69 Correct 29 ms 8004 KB Output is correct
70 Correct 32 ms 7884 KB Output is correct
71 Correct 38 ms 7996 KB Output is correct
72 Correct 30 ms 7984 KB Output is correct
73 Correct 30 ms 8104 KB Output is correct
74 Correct 32 ms 8260 KB Output is correct