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Submission #525281

# Submission time Handle Problem Language Result Execution time Memory
525281 2022-02-11T08:57:24 Z qwerasdfzxcl Mountains and Valleys (CCO20_day1problem3) C++14
11 / 25
 7000 ms 12824 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){
    cyc.push_back(s);
    if (s==e) return 1;
    for (auto &v:adj[s]) if (v.v!=pa && on[v.i]){
        P.push_back(v.i);
        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;
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, m;
    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){
        P.clear();
        cyc.clear();
        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;
        int len = W[e.i] + P.size();

        for (auto &x:P) on[x] = 0;
        for (auto &x:cyc) ans = min(ans, cur*2 - len - calc(x, n));
        ///

        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

# Verdict Execution time Memory Grader output
1 Correct 7 ms 11980 KB Output is correct
2 Correct 7 ms 11980 KB Output is correct
3 Correct 7 ms 11980 KB Output is correct
4 Correct 6 ms 12064 KB Output is correct
5 Correct 8 ms 11980 KB Output is correct
6 Correct 6 ms 11980 KB Output is correct
7 Correct 6 ms 12000 KB Output is correct
8 Correct 7 ms 11980 KB Output is correct
9 Correct 7 ms 11980 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 8 ms 11980 KB Output is correct
12 Correct 7 ms 11980 KB Output is correct
13 Correct 7 ms 11996 KB Output is correct
14 Correct 7 ms 11980 KB Output is correct
15 Correct 7 ms 11980 KB Output is correct

Subtask #2
2.0 / 2.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 11980 KB Output is correct
2 Correct 7 ms 11980 KB Output is correct
3 Correct 7 ms 11980 KB Output is correct
4 Correct 6 ms 12064 KB Output is correct
5 Correct 8 ms 11980 KB Output is correct
6 Correct 6 ms 11980 KB Output is correct
7 Correct 6 ms 12000 KB Output is correct
8 Correct 7 ms 11980 KB Output is correct
9 Correct 7 ms 11980 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 8 ms 11980 KB Output is correct
12 Correct 7 ms 11980 KB Output is correct
13 Correct 7 ms 11996 KB Output is correct
14 Correct 7 ms 11980 KB Output is correct
15 Correct 7 ms 11980 KB Output is correct
16 Correct 8 ms 11980 KB Output is correct
17 Correct 6 ms 11980 KB Output is correct
18 Correct 7 ms 11980 KB Output is correct
19 Correct 7 ms 11980 KB Output is correct
20 Correct 7 ms 12072 KB Output is correct
21 Correct 7 ms 11980 KB Output is correct
22 Correct 8 ms 11980 KB Output is correct
23 Correct 7 ms 12032 KB Output is correct
24 Correct 7 ms 11980 KB Output is correct
25 Correct 7 ms 11980 KB Output is correct
26 Correct 7 ms 11980 KB Output is correct
27 Correct 7 ms 11980 KB Output is correct
28 Correct 7 ms 11980 KB Output is correct
29 Correct 7 ms 12024 KB Output is correct
30 Correct 7 ms 11980 KB Output is correct
31 Correct 7 ms 12028 KB Output is correct
32 Correct 7 ms 11980 KB Output is correct
33 Correct 7 ms 12060 KB Output is correct
34 Correct 7 ms 11980 KB Output is correct
35 Correct 6 ms 11980 KB Output is correct

Subtask #3
2.0 / 2.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 12772 KB Output is correct
2 Correct 11 ms 12748 KB Output is correct
3 Correct 12 ms 12676 KB Output is correct
4 Correct 12 ms 12644 KB Output is correct
5 Correct 12 ms 12620 KB Output is correct
6 Correct 12 ms 12620 KB Output is correct
7 Correct 11 ms 12824 KB Output is correct
8 Correct 12 ms 12756 KB Output is correct
9 Correct 11 ms 12748 KB Output is correct
10 Correct 10 ms 12620 KB Output is correct
11 Correct 12 ms 12656 KB Output is correct
12 Correct 12 ms 12672 KB Output is correct
13 Correct 12 ms 12644 KB Output is correct
14 Correct 13 ms 12668 KB Output is correct

Subtask #4
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 11980 KB Output is correct
2 Correct 7 ms 11980 KB Output is correct
3 Correct 7 ms 11980 KB Output is correct
4 Correct 6 ms 12064 KB Output is correct
5 Correct 8 ms 11980 KB Output is correct
6 Correct 6 ms 11980 KB Output is correct
7 Correct 6 ms 12000 KB Output is correct
8 Correct 7 ms 11980 KB Output is correct
9 Correct 7 ms 11980 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 8 ms 11980 KB Output is correct
12 Correct 7 ms 11980 KB Output is correct
13 Correct 7 ms 11996 KB Output is correct
14 Correct 7 ms 11980 KB Output is correct
15 Correct 7 ms 11980 KB Output is correct
16 Correct 8 ms 11980 KB Output is correct
17 Correct 6 ms 11980 KB Output is correct
18 Correct 7 ms 11980 KB Output is correct
19 Correct 7 ms 11980 KB Output is correct
20 Correct 7 ms 12072 KB Output is correct
21 Correct 7 ms 11980 KB Output is correct
22 Correct 8 ms 11980 KB Output is correct
23 Correct 7 ms 12032 KB Output is correct
24 Correct 7 ms 11980 KB Output is correct
25 Correct 7 ms 11980 KB Output is correct
26 Correct 7 ms 11980 KB Output is correct
27 Correct 7 ms 11980 KB Output is correct
28 Correct 7 ms 11980 KB Output is correct
29 Correct 7 ms 12024 KB Output is correct
30 Correct 7 ms 11980 KB Output is correct
31 Correct 7 ms 12028 KB Output is correct
32 Correct 7 ms 11980 KB Output is correct
33 Correct 7 ms 12060 KB Output is correct
34 Correct 7 ms 11980 KB Output is correct
35 Correct 6 ms 11980 KB Output is correct
36 Correct 40 ms 11968 KB Output is correct
37 Correct 49 ms 11980 KB Output is correct
38 Correct 38 ms 12072 KB Output is correct
39 Correct 30 ms 12108 KB Output is correct
40 Correct 26 ms 11980 KB Output is correct
41 Correct 8 ms 11980 KB Output is correct
42 Correct 44 ms 12064 KB Output is correct
43 Correct 28 ms 11980 KB Output is correct
44 Correct 33 ms 12064 KB Output is correct
45 Correct 27 ms 11980 KB Output is correct
46 Correct 31 ms 12076 KB Output is correct
47 Correct 28 ms 12080 KB Output is correct
48 Correct 10 ms 11980 KB Output is correct
49 Correct 9 ms 12036 KB Output is correct

Subtask #5
0.0 / 2.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 11980 KB Output is correct
2 Correct 7 ms 11980 KB Output is correct
3 Correct 7 ms 11980 KB Output is correct
4 Correct 6 ms 12064 KB Output is correct
5 Correct 8 ms 11980 KB Output is correct
6 Correct 6 ms 11980 KB Output is correct
7 Correct 6 ms 12000 KB Output is correct
8 Correct 7 ms 11980 KB Output is correct
9 Correct 7 ms 11980 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 8 ms 11980 KB Output is correct
12 Correct 7 ms 11980 KB Output is correct
13 Correct 7 ms 11996 KB Output is correct
14 Correct 7 ms 11980 KB Output is correct
15 Correct 7 ms 11980 KB Output is correct
16 Correct 8 ms 11980 KB Output is correct
17 Correct 6 ms 11980 KB Output is correct
18 Correct 7 ms 11980 KB Output is correct
19 Correct 7 ms 11980 KB Output is correct
20 Correct 7 ms 12072 KB Output is correct
21 Correct 7 ms 11980 KB Output is correct
22 Correct 8 ms 11980 KB Output is correct
23 Correct 7 ms 12032 KB Output is correct
24 Correct 7 ms 11980 KB Output is correct
25 Correct 7 ms 11980 KB Output is correct
26 Correct 7 ms 11980 KB Output is correct
27 Correct 7 ms 11980 KB Output is correct
28 Correct 7 ms 11980 KB Output is correct
29 Correct 7 ms 12024 KB Output is correct
30 Correct 7 ms 11980 KB Output is correct
31 Correct 7 ms 12028 KB Output is correct
32 Correct 7 ms 11980 KB Output is correct
33 Correct 7 ms 12060 KB Output is correct
34 Correct 7 ms 11980 KB Output is correct
35 Correct 6 ms 11980 KB Output is correct
36 Correct 40 ms 11968 KB Output is correct
37 Correct 49 ms 11980 KB Output is correct
38 Correct 38 ms 12072 KB Output is correct
39 Correct 30 ms 12108 KB Output is correct
40 Correct 26 ms 11980 KB Output is correct
41 Correct 8 ms 11980 KB Output is correct
42 Correct 44 ms 12064 KB Output is correct
43 Correct 28 ms 11980 KB Output is correct
44 Correct 33 ms 12064 KB Output is correct
45 Correct 27 ms 11980 KB Output is correct
46 Correct 31 ms 12076 KB Output is correct
47 Correct 28 ms 12080 KB Output is correct
48 Correct 10 ms 11980 KB Output is correct
49 Correct 9 ms 12036 KB Output is correct
50 Correct 5320 ms 12268 KB Output is correct
51 Execution timed out 7098 ms 12076 KB Time limit exceeded
52 Halted 0 ms 0 KB -

Subtask #6
0.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 11980 KB Output is correct
2 Correct 7 ms 11980 KB Output is correct
3 Correct 7 ms 11980 KB Output is correct
4 Correct 6 ms 12064 KB Output is correct
5 Correct 8 ms 11980 KB Output is correct
6 Correct 6 ms 11980 KB Output is correct
7 Correct 6 ms 12000 KB Output is correct
8 Correct 7 ms 11980 KB Output is correct
9 Correct 7 ms 11980 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 8 ms 11980 KB Output is correct
12 Correct 7 ms 11980 KB Output is correct
13 Correct 7 ms 11996 KB Output is correct
14 Correct 7 ms 11980 KB Output is correct
15 Correct 7 ms 11980 KB Output is correct
16 Correct 8 ms 11980 KB Output is correct
17 Correct 6 ms 11980 KB Output is correct
18 Correct 7 ms 11980 KB Output is correct
19 Correct 7 ms 11980 KB Output is correct
20 Correct 7 ms 12072 KB Output is correct
21 Correct 7 ms 11980 KB Output is correct
22 Correct 8 ms 11980 KB Output is correct
23 Correct 7 ms 12032 KB Output is correct
24 Correct 7 ms 11980 KB Output is correct
25 Correct 7 ms 11980 KB Output is correct
26 Correct 7 ms 11980 KB Output is correct
27 Correct 7 ms 11980 KB Output is correct
28 Correct 7 ms 11980 KB Output is correct
29 Correct 7 ms 12024 KB Output is correct
30 Correct 7 ms 11980 KB Output is correct
31 Correct 7 ms 12028 KB Output is correct
32 Correct 7 ms 11980 KB Output is correct
33 Correct 7 ms 12060 KB Output is correct
34 Correct 7 ms 11980 KB Output is correct
35 Correct 6 ms 11980 KB Output is correct
36 Correct 12 ms 12772 KB Output is correct
37 Correct 11 ms 12748 KB Output is correct
38 Correct 12 ms 12676 KB Output is correct
39 Correct 12 ms 12644 KB Output is correct
40 Correct 12 ms 12620 KB Output is correct
41 Correct 12 ms 12620 KB Output is correct
42 Correct 11 ms 12824 KB Output is correct
43 Correct 12 ms 12756 KB Output is correct
44 Correct 11 ms 12748 KB Output is correct
45 Correct 10 ms 12620 KB Output is correct
46 Correct 12 ms 12656 KB Output is correct
47 Correct 12 ms 12672 KB Output is correct
48 Correct 12 ms 12644 KB Output is correct
49 Correct 13 ms 12668 KB Output is correct
50 Correct 40 ms 11968 KB Output is correct
51 Correct 49 ms 11980 KB Output is correct
52 Correct 38 ms 12072 KB Output is correct
53 Correct 30 ms 12108 KB Output is correct
54 Correct 26 ms 11980 KB Output is correct
55 Correct 8 ms 11980 KB Output is correct
56 Correct 44 ms 12064 KB Output is correct
57 Correct 28 ms 11980 KB Output is correct
58 Correct 33 ms 12064 KB Output is correct
59 Correct 27 ms 11980 KB Output is correct
60 Correct 31 ms 12076 KB Output is correct
61 Correct 28 ms 12080 KB Output is correct
62 Correct 10 ms 11980 KB Output is correct
63 Correct 9 ms 12036 KB Output is correct
64 Correct 5320 ms 12268 KB Output is correct
65 Execution timed out 7098 ms 12076 KB Time limit exceeded
66 Halted 0 ms 0 KB -

Subtask #7
0.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 11980 KB Output is correct
2 Correct 7 ms 11980 KB Output is correct
3 Correct 7 ms 11980 KB Output is correct
4 Correct 6 ms 12064 KB Output is correct
5 Correct 8 ms 11980 KB Output is correct
6 Correct 6 ms 11980 KB Output is correct
7 Correct 6 ms 12000 KB Output is correct
8 Correct 7 ms 11980 KB Output is correct
9 Correct 7 ms 11980 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 8 ms 11980 KB Output is correct
12 Correct 7 ms 11980 KB Output is correct
13 Correct 7 ms 11996 KB Output is correct
14 Correct 7 ms 11980 KB Output is correct
15 Correct 7 ms 11980 KB Output is correct
16 Correct 8 ms 11980 KB Output is correct
17 Correct 6 ms 11980 KB Output is correct
18 Correct 7 ms 11980 KB Output is correct
19 Correct 7 ms 11980 KB Output is correct
20 Correct 7 ms 12072 KB Output is correct
21 Correct 7 ms 11980 KB Output is correct
22 Correct 8 ms 11980 KB Output is correct
23 Correct 7 ms 12032 KB Output is correct
24 Correct 7 ms 11980 KB Output is correct
25 Correct 7 ms 11980 KB Output is correct
26 Correct 7 ms 11980 KB Output is correct
27 Correct 7 ms 11980 KB Output is correct
28 Correct 7 ms 11980 KB Output is correct
29 Correct 7 ms 12024 KB Output is correct
30 Correct 7 ms 11980 KB Output is correct
31 Correct 7 ms 12028 KB Output is correct
32 Correct 7 ms 11980 KB Output is correct
33 Correct 7 ms 12060 KB Output is correct
34 Correct 7 ms 11980 KB Output is correct
35 Correct 6 ms 11980 KB Output is correct
36 Correct 12 ms 12772 KB Output is correct
37 Correct 11 ms 12748 KB Output is correct
38 Correct 12 ms 12676 KB Output is correct
39 Correct 12 ms 12644 KB Output is correct
40 Correct 12 ms 12620 KB Output is correct
41 Correct 12 ms 12620 KB Output is correct
42 Correct 11 ms 12824 KB Output is correct
43 Correct 12 ms 12756 KB Output is correct
44 Correct 11 ms 12748 KB Output is correct
45 Correct 10 ms 12620 KB Output is correct
46 Correct 12 ms 12656 KB Output is correct
47 Correct 12 ms 12672 KB Output is correct
48 Correct 12 ms 12644 KB Output is correct
49 Correct 13 ms 12668 KB Output is correct
50 Correct 40 ms 11968 KB Output is correct
51 Correct 49 ms 11980 KB Output is correct
52 Correct 38 ms 12072 KB Output is correct
53 Correct 30 ms 12108 KB Output is correct
54 Correct 26 ms 11980 KB Output is correct
55 Correct 8 ms 11980 KB Output is correct
56 Correct 44 ms 12064 KB Output is correct
57 Correct 28 ms 11980 KB Output is correct
58 Correct 33 ms 12064 KB Output is correct
59 Correct 27 ms 11980 KB Output is correct
60 Correct 31 ms 12076 KB Output is correct
61 Correct 28 ms 12080 KB Output is correct
62 Correct 10 ms 11980 KB Output is correct
63 Correct 9 ms 12036 KB Output is correct
64 Correct 5320 ms 12268 KB Output is correct
65 Execution timed out 7098 ms 12076 KB Time limit exceeded
66 Halted 0 ms 0 KB -

Subtask #8
0.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 11980 KB Output is correct
2 Correct 7 ms 11980 KB Output is correct
3 Correct 7 ms 11980 KB Output is correct
4 Correct 6 ms 12064 KB Output is correct
5 Correct 8 ms 11980 KB Output is correct
6 Correct 6 ms 11980 KB Output is correct
7 Correct 6 ms 12000 KB Output is correct
8 Correct 7 ms 11980 KB Output is correct
9 Correct 7 ms 11980 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 8 ms 11980 KB Output is correct
12 Correct 7 ms 11980 KB Output is correct
13 Correct 7 ms 11996 KB Output is correct
14 Correct 7 ms 11980 KB Output is correct
15 Correct 7 ms 11980 KB Output is correct
16 Correct 8 ms 11980 KB Output is correct
17 Correct 6 ms 11980 KB Output is correct
18 Correct 7 ms 11980 KB Output is correct
19 Correct 7 ms 11980 KB Output is correct
20 Correct 7 ms 12072 KB Output is correct
21 Correct 7 ms 11980 KB Output is correct
22 Correct 8 ms 11980 KB Output is correct
23 Correct 7 ms 12032 KB Output is correct
24 Correct 7 ms 11980 KB Output is correct
25 Correct 7 ms 11980 KB Output is correct
26 Correct 7 ms 11980 KB Output is correct
27 Correct 7 ms 11980 KB Output is correct
28 Correct 7 ms 11980 KB Output is correct
29 Correct 7 ms 12024 KB Output is correct
30 Correct 7 ms 11980 KB Output is correct
31 Correct 7 ms 12028 KB Output is correct
32 Correct 7 ms 11980 KB Output is correct
33 Correct 7 ms 12060 KB Output is correct
34 Correct 7 ms 11980 KB Output is correct
35 Correct 6 ms 11980 KB Output is correct
36 Correct 12 ms 12772 KB Output is correct
37 Correct 11 ms 12748 KB Output is correct
38 Correct 12 ms 12676 KB Output is correct
39 Correct 12 ms 12644 KB Output is correct
40 Correct 12 ms 12620 KB Output is correct
41 Correct 12 ms 12620 KB Output is correct
42 Correct 11 ms 12824 KB Output is correct
43 Correct 12 ms 12756 KB Output is correct
44 Correct 11 ms 12748 KB Output is correct
45 Correct 10 ms 12620 KB Output is correct
46 Correct 12 ms 12656 KB Output is correct
47 Correct 12 ms 12672 KB Output is correct
48 Correct 12 ms 12644 KB Output is correct
49 Correct 13 ms 12668 KB Output is correct
50 Correct 40 ms 11968 KB Output is correct
51 Correct 49 ms 11980 KB Output is correct
52 Correct 38 ms 12072 KB Output is correct
53 Correct 30 ms 12108 KB Output is correct
54 Correct 26 ms 11980 KB Output is correct
55 Correct 8 ms 11980 KB Output is correct
56 Correct 44 ms 12064 KB Output is correct
57 Correct 28 ms 11980 KB Output is correct
58 Correct 33 ms 12064 KB Output is correct
59 Correct 27 ms 11980 KB Output is correct
60 Correct 31 ms 12076 KB Output is correct
61 Correct 28 ms 12080 KB Output is correct
62 Correct 10 ms 11980 KB Output is correct
63 Correct 9 ms 12036 KB Output is correct
64 Correct 5320 ms 12268 KB Output is correct
65 Execution timed out 7098 ms 12076 KB Time limit exceeded
66 Halted 0 ms 0 KB -