oj.uz

Submission #885162

# Submission time Handle Problem Language Result Execution time Memory
885162 2023-12-09T05:34:43 Z 12345678 Pipes (BOI13_pipes) C++17
98.7037 / 100
 1000 ms 37324 KB 
#include <bits/stdc++.h>

using namespace std;

#define ll long long

const int nx=5e5+5;
int n, m, h[nx], u, v, sz, res[nx], vs[nx], cy[nx], pa[nx], pidx[nx], cnt, lst;
vector<pair<int, int>> d[nx], c;

void dfs(int u, int p, int idx)
{
    vs[u]=1; pa[u]=p; pidx[u]=idx;
    for (auto [v, id]:d[u]) 
    {
        if (v==p||cy[v]) continue;
        if (!vs[v]) dfs(v, u, id);
        else
        {
            int tmp=u;
            while (tmp!=v) cy[tmp]=1, c.push_back({tmp, pidx[tmp]}), tmp=pa[tmp], cnt++;
            cy[v]=1; cnt++; c.push_back({v, id});
        }
    }
    if (idx==-1||m==n) return;
    res[idx]=2*h[u];
    h[p]-=h[u];
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>m;
    for (int i=1; i<=n; i++) cin>>h[i];
    for (int i=1; i<=m; i++) cin>>u>>v, d[u].push_back({v, i}), d[v].push_back({u, i});
    if (m>n) {cout<<0; return 0;}
    dfs(1, 1, -1);
    if (cnt%2==0&&cnt!=0) {cout<<0; return 0;}
    if (m<n) for (int i=1; i<n; i++) cout<<res[i]<<'\n';
    else
    {
        m=n-1;
        for (int i=1; i<=n; i++) vs[i]=0;
        for (auto [x, y]:c) dfs(x, x, -1);
        int l=-1e9, r=1e9;
        while (l<=r)
        {
            vector<int> t(c.size());
            int md=(l+r+1)/2;
            //cout<<"here "<<l<<' '<<r<<' '<<md<<'\n';
            lst=md;
            t[0]+=md;
            t[c.size()-1]+=md;
            res[c[c.size()-1].second]=2*md;
            for (int i=1; i<c.size(); i++) t[i]+=(h[c[i-1].first]-t[i-1]), res[c[i-1].second]=2*(h[c[i-1].first]-t[i-1]);
            if (t[c.size()-1]==h[c[c.size()-1].first]) break;
            if (t[c.size()-1]>=h[c[c.size()-1].first]) r=md;
            else l=md;
        }
        //for (int i=1; i<=n; i++) if (cy[i]) cout<<i<<' '<<h[i]<<'\n';
        for (int i=1; i<=m+1; i++) cout<<res[i]<<'\n';
    }
}

/*
4 4
2 0 2 2
1 2
1 3
2 3
3 4
*/

Compilation message

pipes.cpp: In function 'int main()':
pipes.cpp:55:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |             for (int i=1; i<c.size(); i++) t[i]+=(h[c[i-1].first]-t[i-1]), res[c[i-1].second]=2*(h[c[i-1].first]-t[i-1]);
      |                           ~^~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 21084 KB Output is correct
2 Correct 4 ms 21008 KB Output is correct
3 Correct 5 ms 21084 KB Output is correct
4 Correct 41 ms 25252 KB Output is correct
5 Correct 3 ms 21084 KB Output is correct
6 Correct 4 ms 21084 KB Output is correct
7 Correct 3 ms 21084 KB Output is correct
8 Correct 4 ms 21084 KB Output is correct
9 Correct 4 ms 21084 KB Output is correct
10 Correct 4 ms 21080 KB Output is correct
11 Correct 4 ms 21084 KB Output is correct
12 Correct 4 ms 21084 KB Output is correct
13 Correct 32 ms 24480 KB Output is correct
14 Correct 49 ms 24948 KB Output is correct
15 Correct 40 ms 25180 KB Output is correct
16 Correct 34 ms 24484 KB Output is correct
17 Correct 42 ms 25172 KB Output is correct
18 Correct 44 ms 25324 KB Output is correct
19 Correct 47 ms 30804 KB Output is correct
20 Correct 4 ms 21084 KB Output is correct
21 Correct 4 ms 21196 KB Output is correct
22 Correct 41 ms 25320 KB Output is correct
23 Correct 31 ms 24400 KB Output is correct
24 Correct 41 ms 25344 KB Output is correct
25 Correct 34 ms 24404 KB Output is correct

Subtask #2
68.7037037037 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 21084 KB Output is correct
2 Correct 4 ms 21340 KB Output is correct
3 Correct 41 ms 29140 KB Output is correct
4 Correct 28 ms 18256 KB Output is correct
5 Correct 31 ms 18256 KB Output is correct
6 Correct 113 ms 28716 KB Output is correct
7 Correct 4 ms 21080 KB Output is correct
8 Correct 4 ms 21080 KB Output is correct
9 Correct 3 ms 19036 KB Output is correct
10 Correct 3 ms 14936 KB Output is correct
11 Correct 3 ms 14940 KB Output is correct
12 Correct 3 ms 14940 KB Output is correct
13 Correct 3 ms 14940 KB Output is correct
14 Execution timed out 1096 ms 21084 KB Time limit exceeded
15 Correct 4 ms 21336 KB Output is correct
16 Correct 4 ms 21084 KB Output is correct
17 Correct 4 ms 19036 KB Output is correct
18 Correct 3 ms 14936 KB Output is correct
19 Correct 3 ms 14940 KB Output is correct
20 Correct 4 ms 14940 KB Output is correct
21 Correct 3 ms 14940 KB Output is correct
22 Correct 4 ms 21084 KB Output is correct
23 Correct 47 ms 31516 KB Output is correct
24 Correct 60 ms 32468 KB Output is correct
25 Correct 38 ms 28752 KB Output is correct
26 Correct 29 ms 18308 KB Output is correct
27 Correct 29 ms 17984 KB Output is correct
28 Correct 30 ms 18512 KB Output is correct
29 Correct 90 ms 26080 KB Output is correct
30 Correct 65 ms 36368 KB Output is correct
31 Correct 59 ms 37068 KB Output is correct
32 Correct 65 ms 27852 KB Output is correct
33 Correct 40 ms 30424 KB Output is correct
34 Correct 36 ms 18052 KB Output is correct
35 Correct 38 ms 18336 KB Output is correct
36 Correct 29 ms 18396 KB Output is correct
37 Correct 109 ms 28716 KB Output is correct
38 Correct 57 ms 35016 KB Output is correct
39 Correct 57 ms 26996 KB Output is correct
40 Correct 51 ms 31812 KB Output is correct
41 Correct 50 ms 34716 KB Output is correct
42 Correct 28 ms 18248 KB Output is correct
43 Correct 33 ms 18068 KB Output is correct
44 Correct 29 ms 18256 KB Output is correct
45 Correct 86 ms 27140 KB Output is correct
46 Correct 70 ms 37324 KB Output is correct
47 Correct 58 ms 32204 KB Output is correct
48 Correct 61 ms 36536 KB Output is correct
49 Correct 34 ms 24912 KB Output is correct
50 Correct 32 ms 18260 KB Output is correct
51 Correct 33 ms 18268 KB Output is correct
52 Correct 29 ms 18012 KB Output is correct
53 Correct 90 ms 26892 KB Output is correct
54 Correct 58 ms 33872 KB Output is correct