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Submission #524832

# Submission time Handle Problem Language Result Execution time Memory
524832 2022-02-10T06:33:05 Z qwerasdfzxcl Mountains and Valleys (CCO20_day1problem3) C++14
1 / 25
 7000 ms 13004 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;
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);
        if (dfs0(v.v, e, s)) return 1;
        P.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;
void calc(int n){
    dfs(0);
    dfs(max_element(dist, dist+n)-dist);
    ans = min(ans, cur*2 - *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);
    }

    calc(n);

    for (auto &e:E){
        P.clear();
        dfs0(e.v, e.w);
        if ((int)P.size()<=W[e.i]) continue;

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

        for (auto &x:P){
            on[x] = 0, cur -= W[x];
            calc(n);
            on[x] = 1, cur += W[x];
        }
        on[e.i] = 0, cur -= W[e.i];
    }

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

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:40:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
Main.cpp:43:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |         scanf("%d %d %d", &x, &y, &z);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
1.0 / 1.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 12028 KB Output is correct
2 Correct 6 ms 12056 KB Output is correct
3 Correct 7 ms 12052 KB Output is correct
4 Correct 6 ms 12044 KB Output is correct
5 Correct 6 ms 11980 KB Output is correct
6 Correct 6 ms 12056 KB Output is correct
7 Correct 7 ms 11980 KB Output is correct
8 Correct 6 ms 12044 KB Output is correct
9 Correct 6 ms 11980 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 7 ms 11980 KB Output is correct
12 Correct 6 ms 12048 KB Output is correct
13 Correct 7 ms 12044 KB Output is correct
14 Correct 6 ms 11980 KB Output is correct
15 Correct 7 ms 12060 KB Output is correct

Subtask #2
0.0 / 2.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 12028 KB Output is correct
2 Correct 6 ms 12056 KB Output is correct
3 Correct 7 ms 12052 KB Output is correct
4 Correct 6 ms 12044 KB Output is correct
5 Correct 6 ms 11980 KB Output is correct
6 Correct 6 ms 12056 KB Output is correct
7 Correct 7 ms 11980 KB Output is correct
8 Correct 6 ms 12044 KB Output is correct
9 Correct 6 ms 11980 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 7 ms 11980 KB Output is correct
12 Correct 6 ms 12048 KB Output is correct
13 Correct 7 ms 12044 KB Output is correct
14 Correct 6 ms 11980 KB Output is correct
15 Correct 7 ms 12060 KB Output is correct
16 Correct 6 ms 11980 KB Output is correct
17 Correct 7 ms 12132 KB Output is correct
18 Incorrect 7 ms 11980 KB Output isn't correct
19 Halted 0 ms 0 KB -

Subtask #3
0.0 / 2.0

# Verdict Execution time Memory Grader output
1 Execution timed out 7073 ms 13004 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 12028 KB Output is correct
2 Correct 6 ms 12056 KB Output is correct
3 Correct 7 ms 12052 KB Output is correct
4 Correct 6 ms 12044 KB Output is correct
5 Correct 6 ms 11980 KB Output is correct
6 Correct 6 ms 12056 KB Output is correct
7 Correct 7 ms 11980 KB Output is correct
8 Correct 6 ms 12044 KB Output is correct
9 Correct 6 ms 11980 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 7 ms 11980 KB Output is correct
12 Correct 6 ms 12048 KB Output is correct
13 Correct 7 ms 12044 KB Output is correct
14 Correct 6 ms 11980 KB Output is correct
15 Correct 7 ms 12060 KB Output is correct
16 Correct 6 ms 11980 KB Output is correct
17 Correct 7 ms 12132 KB Output is correct
18 Incorrect 7 ms 11980 KB Output isn't correct
19 Halted 0 ms 0 KB -

Subtask #5
0.0 / 2.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 12028 KB Output is correct
2 Correct 6 ms 12056 KB Output is correct
3 Correct 7 ms 12052 KB Output is correct
4 Correct 6 ms 12044 KB Output is correct
5 Correct 6 ms 11980 KB Output is correct
6 Correct 6 ms 12056 KB Output is correct
7 Correct 7 ms 11980 KB Output is correct
8 Correct 6 ms 12044 KB Output is correct
9 Correct 6 ms 11980 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 7 ms 11980 KB Output is correct
12 Correct 6 ms 12048 KB Output is correct
13 Correct 7 ms 12044 KB Output is correct
14 Correct 6 ms 11980 KB Output is correct
15 Correct 7 ms 12060 KB Output is correct
16 Correct 6 ms 11980 KB Output is correct
17 Correct 7 ms 12132 KB Output is correct
18 Incorrect 7 ms 11980 KB Output isn't correct
19 Halted 0 ms 0 KB -

Subtask #6
0.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 12028 KB Output is correct
2 Correct 6 ms 12056 KB Output is correct
3 Correct 7 ms 12052 KB Output is correct
4 Correct 6 ms 12044 KB Output is correct
5 Correct 6 ms 11980 KB Output is correct
6 Correct 6 ms 12056 KB Output is correct
7 Correct 7 ms 11980 KB Output is correct
8 Correct 6 ms 12044 KB Output is correct
9 Correct 6 ms 11980 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 7 ms 11980 KB Output is correct
12 Correct 6 ms 12048 KB Output is correct
13 Correct 7 ms 12044 KB Output is correct
14 Correct 6 ms 11980 KB Output is correct
15 Correct 7 ms 12060 KB Output is correct
16 Correct 6 ms 11980 KB Output is correct
17 Correct 7 ms 12132 KB Output is correct
18 Incorrect 7 ms 11980 KB Output isn't correct
19 Halted 0 ms 0 KB -

Subtask #7
0.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 12028 KB Output is correct
2 Correct 6 ms 12056 KB Output is correct
3 Correct 7 ms 12052 KB Output is correct
4 Correct 6 ms 12044 KB Output is correct
5 Correct 6 ms 11980 KB Output is correct
6 Correct 6 ms 12056 KB Output is correct
7 Correct 7 ms 11980 KB Output is correct
8 Correct 6 ms 12044 KB Output is correct
9 Correct 6 ms 11980 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 7 ms 11980 KB Output is correct
12 Correct 6 ms 12048 KB Output is correct
13 Correct 7 ms 12044 KB Output is correct
14 Correct 6 ms 11980 KB Output is correct
15 Correct 7 ms 12060 KB Output is correct
16 Correct 6 ms 11980 KB Output is correct
17 Correct 7 ms 12132 KB Output is correct
18 Incorrect 7 ms 11980 KB Output isn't correct
19 Halted 0 ms 0 KB -

Subtask #8
0.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 12028 KB Output is correct
2 Correct 6 ms 12056 KB Output is correct
3 Correct 7 ms 12052 KB Output is correct
4 Correct 6 ms 12044 KB Output is correct
5 Correct 6 ms 11980 KB Output is correct
6 Correct 6 ms 12056 KB Output is correct
7 Correct 7 ms 11980 KB Output is correct
8 Correct 6 ms 12044 KB Output is correct
9 Correct 6 ms 11980 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 7 ms 11980 KB Output is correct
12 Correct 6 ms 12048 KB Output is correct
13 Correct 7 ms 12044 KB Output is correct
14 Correct 6 ms 11980 KB Output is correct
15 Correct 7 ms 12060 KB Output is correct
16 Correct 6 ms 11980 KB Output is correct
17 Correct 7 ms 12132 KB Output is correct
18 Incorrect 7 ms 11980 KB Output isn't correct
19 Halted 0 ms 0 KB -