oj.uz

Submission #83605

# Submission time Handle Problem Language Result Execution time Memory
83605 2018-11-09T13:26:37 Z Bodo171 Pipes (BOI13_pipes) C++14
74.0741 / 100
 109 ms 11844 KB 
#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
const int nmax=100005;
vector< pair<int,int> > v[nmax];
pair<int,int> cyc[nmax];
int rep[nmax],wh[nmax],mu[nmax],viz[nmax],ans[nmax],vreau[nmax],am[nmax];
int n,nr,m,i,j,sz,x,y,act,a,b;
void solve(int x)
{
    int nod=0;
    viz[x]=1;
    for(int i=0;i<v[x].size();i++)
        if(!viz[v[x][i].first])
    {
        nod=v[x][i].first;
        solve(nod);
        ans[v[x][i].second]=vreau[nod]-am[nod];
        am[x]+=(vreau[nod]-am[nod]);
    }
}
int it=0;
bool gasit;
void dfs(int x)
{
    rep[++nr]=x;wh[x]=nr;
    for(int i=0;i<v[x].size()&&(!gasit);i++)
    {
        mu[nr]=v[x][i].second;
        if(!wh[v[x][i].first])
        {
            dfs(v[x][i].first);
        }
        else
        {
            if(wh[v[x][i].first]!=nr-1)
            {
                gasit=1;
                for(j=wh[v[x][i].first];j<=nr;j++)
                {
                    cyc[++sz]={rep[j],mu[j]};
                }
            }
        }
    }
    nr--;
}
void gaseste_ciclu()
{
    dfs(1);
    for(i=1;i<=sz;i++)
        viz[cyc[i].first]=1;
    if(!(sz%2))
    {
        cout<<"0";
        return;
    }
    for(i=1;i<=sz;i++)
    {
        x=cyc[i].first;
        dfs(x);
        vreau[x]-=am[x];
    }
    for(i=1;i<=sz;i++)
    {
        x=cyc[i].first;
        if((i&1)) act+=vreau[x];
        else act-=vreau[x];
    }
    if(act%2)
    {
        cout<<"0";
        return;
    }
    ans[cyc[sz].second]=act/2;
    cyc[0]=cyc[sz];
    for(i=1;i<sz;i++)
    {
        ans[cyc[i].second]=vreau[cyc[i].first]-ans[cyc[i-1].second];
    }
    for(i=1;i<=m;i++)
        cout<<2*ans[i]<<'\n';
}
int main()
{
   // freopen("data.in","r",stdin);
    ios_base::sync_with_stdio(false);
    cin>>n>>m;
    if(m>n)
    {
        cout<<"0";
        return 0;
    }
    for(i=1;i<=n;i++)
    {
        cin>>vreau[i];
    }
    for(i=1;i<=m;i++)
    {
        cin>>a>>b;
        v[a].push_back({b,i});
        v[b].push_back({a,i});
    }
    if(m==n-1)
    {
        solve(1);
        if(vreau[1]-am[1])
        {
            cout<<"0";
            return 0;
        }
        for(i=1;i<=m;i++)
            cout<<2*ans[i]<<'\n';
    }
    else
    {
        gaseste_ciclu();
    }
    return 0;
}

Compilation message

pipes.cpp: In function 'void solve(int)':
pipes.cpp:14:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<v[x].size();i++)
                 ~^~~~~~~~~~~~
pipes.cpp: In function 'void dfs(int)':
pipes.cpp:28:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<v[x].size()&&(!gasit);i++)
                 ~^~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2684 KB Output is correct
2 Correct 4 ms 2816 KB Output is correct
3 Correct 5 ms 2892 KB Output is correct
4 Correct 90 ms 8612 KB Output is correct
5 Correct 4 ms 8612 KB Output is correct
6 Correct 4 ms 8612 KB Output is correct
7 Correct 4 ms 8612 KB Output is correct
8 Correct 5 ms 8612 KB Output is correct
9 Correct 4 ms 8612 KB Output is correct
10 Correct 4 ms 8612 KB Output is correct
11 Correct 5 ms 8612 KB Output is correct
12 Correct 5 ms 8612 KB Output is correct
13 Correct 86 ms 8612 KB Output is correct
14 Correct 82 ms 8612 KB Output is correct
15 Correct 79 ms 8840 KB Output is correct
16 Correct 70 ms 8840 KB Output is correct
17 Correct 96 ms 8840 KB Output is correct
18 Correct 86 ms 8972 KB Output is correct
19 Correct 103 ms 10608 KB Output is correct
20 Correct 4 ms 10608 KB Output is correct
21 Correct 5 ms 10608 KB Output is correct
22 Correct 80 ms 10608 KB Output is correct
23 Correct 66 ms 10608 KB Output is correct
24 Correct 82 ms 10608 KB Output is correct
25 Correct 60 ms 10608 KB Output is correct

Subtask #2
44.0740740741 / 70.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 10608 KB Output isn't correct
2 Incorrect 4 ms 10608 KB Output isn't correct
3 Correct 76 ms 10608 KB Output is correct
4 Correct 4 ms 10608 KB Output is correct
5 Correct 4 ms 10608 KB Output is correct
6 Correct 4 ms 10608 KB Output is correct
7 Incorrect 4 ms 10608 KB Output isn't correct
8 Incorrect 4 ms 10608 KB Output isn't correct
9 Correct 4 ms 10608 KB Output is correct
10 Correct 4 ms 10608 KB Output is correct
11 Correct 4 ms 10608 KB Output is correct
12 Correct 4 ms 10608 KB Output is correct
13 Correct 4 ms 10608 KB Output is correct
14 Incorrect 4 ms 10608 KB Output isn't correct
15 Incorrect 4 ms 10608 KB Output isn't correct
16 Incorrect 4 ms 10608 KB Output isn't correct
17 Correct 5 ms 10608 KB Output is correct
18 Correct 4 ms 10608 KB Output is correct
19 Correct 4 ms 10608 KB Output is correct
20 Correct 4 ms 10608 KB Output is correct
21 Correct 4 ms 10608 KB Output is correct
22 Incorrect 4 ms 10608 KB Output isn't correct
23 Incorrect 97 ms 10608 KB Output isn't correct
24 Incorrect 78 ms 10608 KB Output isn't correct
25 Correct 70 ms 10608 KB Output is correct
26 Correct 5 ms 10608 KB Output is correct
27 Correct 4 ms 10608 KB Output is correct
28 Correct 4 ms 10608 KB Output is correct
29 Correct 4 ms 10608 KB Output is correct
30 Incorrect 83 ms 11844 KB Output isn't correct
31 Incorrect 86 ms 11844 KB Output isn't correct
32 Incorrect 71 ms 11844 KB Output isn't correct
33 Correct 67 ms 11844 KB Output is correct
34 Correct 4 ms 11844 KB Output is correct
35 Correct 4 ms 11844 KB Output is correct
36 Correct 4 ms 11844 KB Output is correct
37 Correct 5 ms 11844 KB Output is correct
38 Incorrect 75 ms 11844 KB Output isn't correct
39 Incorrect 77 ms 11844 KB Output isn't correct
40 Incorrect 80 ms 11844 KB Output isn't correct
41 Correct 83 ms 11844 KB Output is correct
42 Correct 4 ms 11844 KB Output is correct
43 Correct 4 ms 11844 KB Output is correct
44 Correct 4 ms 11844 KB Output is correct
45 Correct 4 ms 11844 KB Output is correct
46 Incorrect 94 ms 11844 KB Output isn't correct
47 Incorrect 86 ms 11844 KB Output isn't correct
48 Incorrect 109 ms 11844 KB Output isn't correct
49 Correct 66 ms 11844 KB Output is correct
50 Correct 4 ms 11844 KB Output is correct
51 Correct 4 ms 11844 KB Output is correct
52 Correct 4 ms 11844 KB Output is correct
53 Correct 4 ms 11844 KB Output is correct
54 Incorrect 102 ms 11844 KB Output isn't correct