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답안 #525273

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
525273 2022-02-11T08:49:23 Z qwerasdfzxcl Mountains and Valleys (CCO20_day1problem3) C++14
11 / 25
 7000 ms 12880 KB 
#include <bits/stdc++.h>

typedef long long ll;
using namespace std;
struct Edge{
    int v, w, i;
    Edge(){}
    Edge(int _v, int _w, int _i): v(_v), w(_w), i(_i) {}
};
vector<Edge> adj[500500];
int on[2002000], W[2002000], dist[500500];
vector<Edge> E;

vector<int> P, cyc;
bool dfs0(int s, int e, int pa = -1){
    if (s==e) return 1;
    for (auto &v:adj[s]) if (v.v!=pa && on[v.i]){
        P.push_back(v.i);
        cyc.push_back(v.v);
        if (dfs0(v.v, e, s)) return 1;
        P.pop_back();
        cyc.pop_back();
    }
    return 0;
}

void dfs(int s, int pa = -1, int w = 0){
    if (pa==-1) dist[s] = 0;
    else dist[s] = dist[pa] + w;
    for (auto &v:adj[s]) if (v.v!=pa && on[v.i]) dfs(v.v, s, v.w);
}

int cur = 0, ans = 1e9, m;
int calc(int s, int n){
    fill(dist, dist+n, 0);
    dfs(s);
    if (*max_element(dist, dist+n)==0) return 0;

    dfs(max_element(dist, dist+n)-dist);

    return *max_element(dist, dist+n);
}

int main(){
    int n;
    scanf("%d %d", &n, &m);
    for (int i=1;i<=m;i++){
        int x, y, z;
        scanf("%d %d %d", &x, &y, &z);
        adj[x].emplace_back(y, z, i);
        adj[y].emplace_back(x, z, i);
        W[i] = z;

        if (z==1) on[i] = 1, cur++;
        else E.emplace_back(x, y, i);
    }

    ans = min(ans, cur*2 - calc(0, n));

    if (n>500) {printf("%d\n", ans); return 0;}

    for (auto &e:E){
        //printf(" %d %d\n", e.v, e.w);
        P.clear();
        cyc.clear();
        cyc.push_back(e.v);
        assert(dfs0(e.v, e.w));

        on[e.i] = 1, cur += W[e.i];

        int tval = 1e9;
        for (auto &x:P){
            on[x] = 0, cur -= W[x];
            ans = min(ans, cur*2 - calc(0, n));
            tval = min(tval, cur*2 - calc(0, n));
            on[x] = 1, cur += W[x];
        }

        ///cycle
        on[e.i] = 0;
        vector<int> deep;

        int len = W[e.i] + P.size();

        for (auto &x:P) on[x] = 0;
        for (auto &x:cyc){
            fill(dist, dist+n, 0);
            dfs(x);
            deep.push_back(*max_element(dist, dist+n));
            ans = min(ans, cur*2-len-calc(x, n));
            //printf("%d: %d\n", x, calc(x, n));
            //for (int i=1;i<=9;i++) printf("%d", on[i]);
            //printf("\n");
        }


        for (int i=0;i<(int)cyc.size();i++){
            int clen = 0;
            for (int j=i+1;j<(int)cyc.size();j++){
                clen = j-i;
                assert(cur*2 - (max(clen, len-clen) + deep[i] + deep[j]) >= tval);
                ans = min(ans, cur*2 - (max(clen, len-clen) + deep[i] + deep[j]));
            }
        }

        ///

        for (auto &x:P) on[x] = 1;

        on[e.i] = 0, cur -= W[e.i];
    }

    printf("%d\n", ans);
    return 0;
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:46:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
Main.cpp:49:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |         scanf("%d %d %d", &x, &y, &z);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
1.0 / 1.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 11980 KB Output is correct
2 Correct 7 ms 11972 KB Output is correct
3 Correct 6 ms 11980 KB Output is correct
4 Correct 7 ms 11976 KB Output is correct
5 Correct 6 ms 11976 KB Output is correct
6 Correct 7 ms 11980 KB Output is correct
7 Correct 7 ms 12052 KB Output is correct
8 Correct 6 ms 11980 KB Output is correct
9 Correct 7 ms 12052 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 7 ms 12056 KB Output is correct
12 Correct 7 ms 12108 KB Output is correct
13 Correct 7 ms 12052 KB Output is correct
14 Correct 7 ms 12076 KB Output is correct
15 Correct 6 ms 12056 KB Output is correct

Subtask #2
2.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 11980 KB Output is correct
2 Correct 7 ms 11972 KB Output is correct
3 Correct 6 ms 11980 KB Output is correct
4 Correct 7 ms 11976 KB Output is correct
5 Correct 6 ms 11976 KB Output is correct
6 Correct 7 ms 11980 KB Output is correct
7 Correct 7 ms 12052 KB Output is correct
8 Correct 6 ms 11980 KB Output is correct
9 Correct 7 ms 12052 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 7 ms 12056 KB Output is correct
12 Correct 7 ms 12108 KB Output is correct
13 Correct 7 ms 12052 KB Output is correct
14 Correct 7 ms 12076 KB Output is correct
15 Correct 6 ms 12056 KB Output is correct
16 Correct 7 ms 12044 KB Output is correct
17 Correct 7 ms 12032 KB Output is correct
18 Correct 6 ms 11972 KB Output is correct
19 Correct 6 ms 11980 KB Output is correct
20 Correct 7 ms 12068 KB Output is correct
21 Correct 8 ms 12024 KB Output is correct
22 Correct 7 ms 11988 KB Output is correct
23 Correct 8 ms 11980 KB Output is correct
24 Correct 7 ms 11988 KB Output is correct
25 Correct 7 ms 11988 KB Output is correct
26 Correct 6 ms 12064 KB Output is correct
27 Correct 7 ms 11988 KB Output is correct
28 Correct 7 ms 11988 KB Output is correct
29 Correct 7 ms 12108 KB Output is correct
30 Correct 7 ms 12052 KB Output is correct
31 Correct 7 ms 11980 KB Output is correct
32 Correct 6 ms 11980 KB Output is correct
33 Correct 7 ms 11980 KB Output is correct
34 Correct 6 ms 12024 KB Output is correct
35 Correct 7 ms 11980 KB Output is correct

Subtask #3
2.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 12748 KB Output is correct
2 Correct 11 ms 12780 KB Output is correct
3 Correct 11 ms 12676 KB Output is correct
4 Correct 10 ms 12660 KB Output is correct
5 Correct 10 ms 12672 KB Output is correct
6 Correct 11 ms 12620 KB Output is correct
7 Correct 12 ms 12880 KB Output is correct
8 Correct 11 ms 12752 KB Output is correct
9 Correct 13 ms 12672 KB Output is correct
10 Correct 11 ms 12620 KB Output is correct
11 Correct 12 ms 12716 KB Output is correct
12 Correct 11 ms 12660 KB Output is correct
13 Correct 14 ms 12632 KB Output is correct
14 Correct 11 ms 12760 KB Output is correct

Subtask #4
6.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 11980 KB Output is correct
2 Correct 7 ms 11972 KB Output is correct
3 Correct 6 ms 11980 KB Output is correct
4 Correct 7 ms 11976 KB Output is correct
5 Correct 6 ms 11976 KB Output is correct
6 Correct 7 ms 11980 KB Output is correct
7 Correct 7 ms 12052 KB Output is correct
8 Correct 6 ms 11980 KB Output is correct
9 Correct 7 ms 12052 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 7 ms 12056 KB Output is correct
12 Correct 7 ms 12108 KB Output is correct
13 Correct 7 ms 12052 KB Output is correct
14 Correct 7 ms 12076 KB Output is correct
15 Correct 6 ms 12056 KB Output is correct
16 Correct 7 ms 12044 KB Output is correct
17 Correct 7 ms 12032 KB Output is correct
18 Correct 6 ms 11972 KB Output is correct
19 Correct 6 ms 11980 KB Output is correct
20 Correct 7 ms 12068 KB Output is correct
21 Correct 8 ms 12024 KB Output is correct
22 Correct 7 ms 11988 KB Output is correct
23 Correct 8 ms 11980 KB Output is correct
24 Correct 7 ms 11988 KB Output is correct
25 Correct 7 ms 11988 KB Output is correct
26 Correct 6 ms 12064 KB Output is correct
27 Correct 7 ms 11988 KB Output is correct
28 Correct 7 ms 11988 KB Output is correct
29 Correct 7 ms 12108 KB Output is correct
30 Correct 7 ms 12052 KB Output is correct
31 Correct 7 ms 11980 KB Output is correct
32 Correct 6 ms 11980 KB Output is correct
33 Correct 7 ms 11980 KB Output is correct
34 Correct 6 ms 12024 KB Output is correct
35 Correct 7 ms 11980 KB Output is correct
36 Correct 36 ms 11984 KB Output is correct
37 Correct 48 ms 12080 KB Output is correct
38 Correct 38 ms 12020 KB Output is correct
39 Correct 33 ms 12072 KB Output is correct
40 Correct 25 ms 12008 KB Output is correct
41 Correct 10 ms 12060 KB Output is correct
42 Correct 45 ms 12052 KB Output is correct
43 Correct 29 ms 12040 KB Output is correct
44 Correct 34 ms 12068 KB Output is correct
45 Correct 30 ms 11980 KB Output is correct
46 Correct 32 ms 12056 KB Output is correct
47 Correct 28 ms 11980 KB Output is correct
48 Correct 10 ms 11980 KB Output is correct
49 Correct 10 ms 12068 KB Output is correct

Subtask #5
0.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 11980 KB Output is correct
2 Correct 7 ms 11972 KB Output is correct
3 Correct 6 ms 11980 KB Output is correct
4 Correct 7 ms 11976 KB Output is correct
5 Correct 6 ms 11976 KB Output is correct
6 Correct 7 ms 11980 KB Output is correct
7 Correct 7 ms 12052 KB Output is correct
8 Correct 6 ms 11980 KB Output is correct
9 Correct 7 ms 12052 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 7 ms 12056 KB Output is correct
12 Correct 7 ms 12108 KB Output is correct
13 Correct 7 ms 12052 KB Output is correct
14 Correct 7 ms 12076 KB Output is correct
15 Correct 6 ms 12056 KB Output is correct
16 Correct 7 ms 12044 KB Output is correct
17 Correct 7 ms 12032 KB Output is correct
18 Correct 6 ms 11972 KB Output is correct
19 Correct 6 ms 11980 KB Output is correct
20 Correct 7 ms 12068 KB Output is correct
21 Correct 8 ms 12024 KB Output is correct
22 Correct 7 ms 11988 KB Output is correct
23 Correct 8 ms 11980 KB Output is correct
24 Correct 7 ms 11988 KB Output is correct
25 Correct 7 ms 11988 KB Output is correct
26 Correct 6 ms 12064 KB Output is correct
27 Correct 7 ms 11988 KB Output is correct
28 Correct 7 ms 11988 KB Output is correct
29 Correct 7 ms 12108 KB Output is correct
30 Correct 7 ms 12052 KB Output is correct
31 Correct 7 ms 11980 KB Output is correct
32 Correct 6 ms 11980 KB Output is correct
33 Correct 7 ms 11980 KB Output is correct
34 Correct 6 ms 12024 KB Output is correct
35 Correct 7 ms 11980 KB Output is correct
36 Correct 36 ms 11984 KB Output is correct
37 Correct 48 ms 12080 KB Output is correct
38 Correct 38 ms 12020 KB Output is correct
39 Correct 33 ms 12072 KB Output is correct
40 Correct 25 ms 12008 KB Output is correct
41 Correct 10 ms 12060 KB Output is correct
42 Correct 45 ms 12052 KB Output is correct
43 Correct 29 ms 12040 KB Output is correct
44 Correct 34 ms 12068 KB Output is correct
45 Correct 30 ms 11980 KB Output is correct
46 Correct 32 ms 12056 KB Output is correct
47 Correct 28 ms 11980 KB Output is correct
48 Correct 10 ms 11980 KB Output is correct
49 Correct 10 ms 12068 KB Output is correct
50 Correct 5356 ms 12156 KB Output is correct
51 Execution timed out 7105 ms 12228 KB Time limit exceeded
52 Halted 0 ms 0 KB -

Subtask #6
0.0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 11980 KB Output is correct
2 Correct 7 ms 11972 KB Output is correct
3 Correct 6 ms 11980 KB Output is correct
4 Correct 7 ms 11976 KB Output is correct
5 Correct 6 ms 11976 KB Output is correct
6 Correct 7 ms 11980 KB Output is correct
7 Correct 7 ms 12052 KB Output is correct
8 Correct 6 ms 11980 KB Output is correct
9 Correct 7 ms 12052 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 7 ms 12056 KB Output is correct
12 Correct 7 ms 12108 KB Output is correct
13 Correct 7 ms 12052 KB Output is correct
14 Correct 7 ms 12076 KB Output is correct
15 Correct 6 ms 12056 KB Output is correct
16 Correct 7 ms 12044 KB Output is correct
17 Correct 7 ms 12032 KB Output is correct
18 Correct 6 ms 11972 KB Output is correct
19 Correct 6 ms 11980 KB Output is correct
20 Correct 7 ms 12068 KB Output is correct
21 Correct 8 ms 12024 KB Output is correct
22 Correct 7 ms 11988 KB Output is correct
23 Correct 8 ms 11980 KB Output is correct
24 Correct 7 ms 11988 KB Output is correct
25 Correct 7 ms 11988 KB Output is correct
26 Correct 6 ms 12064 KB Output is correct
27 Correct 7 ms 11988 KB Output is correct
28 Correct 7 ms 11988 KB Output is correct
29 Correct 7 ms 12108 KB Output is correct
30 Correct 7 ms 12052 KB Output is correct
31 Correct 7 ms 11980 KB Output is correct
32 Correct 6 ms 11980 KB Output is correct
33 Correct 7 ms 11980 KB Output is correct
34 Correct 6 ms 12024 KB Output is correct
35 Correct 7 ms 11980 KB Output is correct
36 Correct 11 ms 12748 KB Output is correct
37 Correct 11 ms 12780 KB Output is correct
38 Correct 11 ms 12676 KB Output is correct
39 Correct 10 ms 12660 KB Output is correct
40 Correct 10 ms 12672 KB Output is correct
41 Correct 11 ms 12620 KB Output is correct
42 Correct 12 ms 12880 KB Output is correct
43 Correct 11 ms 12752 KB Output is correct
44 Correct 13 ms 12672 KB Output is correct
45 Correct 11 ms 12620 KB Output is correct
46 Correct 12 ms 12716 KB Output is correct
47 Correct 11 ms 12660 KB Output is correct
48 Correct 14 ms 12632 KB Output is correct
49 Correct 11 ms 12760 KB Output is correct
50 Correct 36 ms 11984 KB Output is correct
51 Correct 48 ms 12080 KB Output is correct
52 Correct 38 ms 12020 KB Output is correct
53 Correct 33 ms 12072 KB Output is correct
54 Correct 25 ms 12008 KB Output is correct
55 Correct 10 ms 12060 KB Output is correct
56 Correct 45 ms 12052 KB Output is correct
57 Correct 29 ms 12040 KB Output is correct
58 Correct 34 ms 12068 KB Output is correct
59 Correct 30 ms 11980 KB Output is correct
60 Correct 32 ms 12056 KB Output is correct
61 Correct 28 ms 11980 KB Output is correct
62 Correct 10 ms 11980 KB Output is correct
63 Correct 10 ms 12068 KB Output is correct
64 Correct 5356 ms 12156 KB Output is correct
65 Execution timed out 7105 ms 12228 KB Time limit exceeded
66 Halted 0 ms 0 KB -

Subtask #7
0.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 11980 KB Output is correct
2 Correct 7 ms 11972 KB Output is correct
3 Correct 6 ms 11980 KB Output is correct
4 Correct 7 ms 11976 KB Output is correct
5 Correct 6 ms 11976 KB Output is correct
6 Correct 7 ms 11980 KB Output is correct
7 Correct 7 ms 12052 KB Output is correct
8 Correct 6 ms 11980 KB Output is correct
9 Correct 7 ms 12052 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 7 ms 12056 KB Output is correct
12 Correct 7 ms 12108 KB Output is correct
13 Correct 7 ms 12052 KB Output is correct
14 Correct 7 ms 12076 KB Output is correct
15 Correct 6 ms 12056 KB Output is correct
16 Correct 7 ms 12044 KB Output is correct
17 Correct 7 ms 12032 KB Output is correct
18 Correct 6 ms 11972 KB Output is correct
19 Correct 6 ms 11980 KB Output is correct
20 Correct 7 ms 12068 KB Output is correct
21 Correct 8 ms 12024 KB Output is correct
22 Correct 7 ms 11988 KB Output is correct
23 Correct 8 ms 11980 KB Output is correct
24 Correct 7 ms 11988 KB Output is correct
25 Correct 7 ms 11988 KB Output is correct
26 Correct 6 ms 12064 KB Output is correct
27 Correct 7 ms 11988 KB Output is correct
28 Correct 7 ms 11988 KB Output is correct
29 Correct 7 ms 12108 KB Output is correct
30 Correct 7 ms 12052 KB Output is correct
31 Correct 7 ms 11980 KB Output is correct
32 Correct 6 ms 11980 KB Output is correct
33 Correct 7 ms 11980 KB Output is correct
34 Correct 6 ms 12024 KB Output is correct
35 Correct 7 ms 11980 KB Output is correct
36 Correct 11 ms 12748 KB Output is correct
37 Correct 11 ms 12780 KB Output is correct
38 Correct 11 ms 12676 KB Output is correct
39 Correct 10 ms 12660 KB Output is correct
40 Correct 10 ms 12672 KB Output is correct
41 Correct 11 ms 12620 KB Output is correct
42 Correct 12 ms 12880 KB Output is correct
43 Correct 11 ms 12752 KB Output is correct
44 Correct 13 ms 12672 KB Output is correct
45 Correct 11 ms 12620 KB Output is correct
46 Correct 12 ms 12716 KB Output is correct
47 Correct 11 ms 12660 KB Output is correct
48 Correct 14 ms 12632 KB Output is correct
49 Correct 11 ms 12760 KB Output is correct
50 Correct 36 ms 11984 KB Output is correct
51 Correct 48 ms 12080 KB Output is correct
52 Correct 38 ms 12020 KB Output is correct
53 Correct 33 ms 12072 KB Output is correct
54 Correct 25 ms 12008 KB Output is correct
55 Correct 10 ms 12060 KB Output is correct
56 Correct 45 ms 12052 KB Output is correct
57 Correct 29 ms 12040 KB Output is correct
58 Correct 34 ms 12068 KB Output is correct
59 Correct 30 ms 11980 KB Output is correct
60 Correct 32 ms 12056 KB Output is correct
61 Correct 28 ms 11980 KB Output is correct
62 Correct 10 ms 11980 KB Output is correct
63 Correct 10 ms 12068 KB Output is correct
64 Correct 5356 ms 12156 KB Output is correct
65 Execution timed out 7105 ms 12228 KB Time limit exceeded
66 Halted 0 ms 0 KB -

Subtask #8
0.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 11980 KB Output is correct
2 Correct 7 ms 11972 KB Output is correct
3 Correct 6 ms 11980 KB Output is correct
4 Correct 7 ms 11976 KB Output is correct
5 Correct 6 ms 11976 KB Output is correct
6 Correct 7 ms 11980 KB Output is correct
7 Correct 7 ms 12052 KB Output is correct
8 Correct 6 ms 11980 KB Output is correct
9 Correct 7 ms 12052 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 7 ms 12056 KB Output is correct
12 Correct 7 ms 12108 KB Output is correct
13 Correct 7 ms 12052 KB Output is correct
14 Correct 7 ms 12076 KB Output is correct
15 Correct 6 ms 12056 KB Output is correct
16 Correct 7 ms 12044 KB Output is correct
17 Correct 7 ms 12032 KB Output is correct
18 Correct 6 ms 11972 KB Output is correct
19 Correct 6 ms 11980 KB Output is correct
20 Correct 7 ms 12068 KB Output is correct
21 Correct 8 ms 12024 KB Output is correct
22 Correct 7 ms 11988 KB Output is correct
23 Correct 8 ms 11980 KB Output is correct
24 Correct 7 ms 11988 KB Output is correct
25 Correct 7 ms 11988 KB Output is correct
26 Correct 6 ms 12064 KB Output is correct
27 Correct 7 ms 11988 KB Output is correct
28 Correct 7 ms 11988 KB Output is correct
29 Correct 7 ms 12108 KB Output is correct
30 Correct 7 ms 12052 KB Output is correct
31 Correct 7 ms 11980 KB Output is correct
32 Correct 6 ms 11980 KB Output is correct
33 Correct 7 ms 11980 KB Output is correct
34 Correct 6 ms 12024 KB Output is correct
35 Correct 7 ms 11980 KB Output is correct
36 Correct 11 ms 12748 KB Output is correct
37 Correct 11 ms 12780 KB Output is correct
38 Correct 11 ms 12676 KB Output is correct
39 Correct 10 ms 12660 KB Output is correct
40 Correct 10 ms 12672 KB Output is correct
41 Correct 11 ms 12620 KB Output is correct
42 Correct 12 ms 12880 KB Output is correct
43 Correct 11 ms 12752 KB Output is correct
44 Correct 13 ms 12672 KB Output is correct
45 Correct 11 ms 12620 KB Output is correct
46 Correct 12 ms 12716 KB Output is correct
47 Correct 11 ms 12660 KB Output is correct
48 Correct 14 ms 12632 KB Output is correct
49 Correct 11 ms 12760 KB Output is correct
50 Correct 36 ms 11984 KB Output is correct
51 Correct 48 ms 12080 KB Output is correct
52 Correct 38 ms 12020 KB Output is correct
53 Correct 33 ms 12072 KB Output is correct
54 Correct 25 ms 12008 KB Output is correct
55 Correct 10 ms 12060 KB Output is correct
56 Correct 45 ms 12052 KB Output is correct
57 Correct 29 ms 12040 KB Output is correct
58 Correct 34 ms 12068 KB Output is correct
59 Correct 30 ms 11980 KB Output is correct
60 Correct 32 ms 12056 KB Output is correct
61 Correct 28 ms 11980 KB Output is correct
62 Correct 10 ms 11980 KB Output is correct
63 Correct 10 ms 12068 KB Output is correct
64 Correct 5356 ms 12156 KB Output is correct
65 Execution timed out 7105 ms 12228 KB Time limit exceeded
66 Halted 0 ms 0 KB -