oj.uz

Submission #83620

# Submission time Handle Problem Language Result Execution time Memory
83620 2018-11-09T13:43:28 Z Bodo171 Pipes (BOI13_pipes) C++14
74.0741 / 100
 188 ms 12572 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];
long long am[nmax],ans[nmax],vreau[nmax];
long long act;
int n,nr,m,i,j,sz,x,y,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:16:18: 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:30:18: 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 2680 KB Output is correct
2 Correct 4 ms 2812 KB Output is correct
3 Correct 4 ms 2848 KB Output is correct
4 Correct 83 ms 9608 KB Output is correct
5 Correct 4 ms 9608 KB Output is correct
6 Correct 4 ms 9608 KB Output is correct
7 Correct 4 ms 9608 KB Output is correct
8 Correct 4 ms 9608 KB Output is correct
9 Correct 5 ms 9608 KB Output is correct
10 Correct 5 ms 9608 KB Output is correct
11 Correct 5 ms 9608 KB Output is correct
12 Correct 5 ms 9608 KB Output is correct
13 Correct 67 ms 9608 KB Output is correct
14 Correct 79 ms 9608 KB Output is correct
15 Correct 84 ms 9972 KB Output is correct
16 Correct 68 ms 9972 KB Output is correct
17 Correct 129 ms 9972 KB Output is correct
18 Correct 97 ms 9980 KB Output is correct
19 Correct 97 ms 11664 KB Output is correct
20 Correct 4 ms 11664 KB Output is correct
21 Correct 5 ms 11664 KB Output is correct
22 Correct 188 ms 11664 KB Output is correct
23 Correct 63 ms 11664 KB Output is correct
24 Correct 76 ms 11664 KB Output is correct
25 Correct 67 ms 11664 KB Output is correct

Subtask #2
44.0740740741 / 70.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 11664 KB Output isn't correct
2 Incorrect 5 ms 11664 KB Output isn't correct
3 Correct 69 ms 11664 KB Output is correct
4 Correct 4 ms 11664 KB Output is correct
5 Correct 4 ms 11664 KB Output is correct
6 Correct 4 ms 11664 KB Output is correct
7 Incorrect 4 ms 11664 KB Output isn't correct
8 Incorrect 4 ms 11664 KB Output isn't correct
9 Correct 4 ms 11664 KB Output is correct
10 Correct 4 ms 11664 KB Output is correct
11 Correct 4 ms 11664 KB Output is correct
12 Correct 5 ms 11664 KB Output is correct
13 Correct 4 ms 11664 KB Output is correct
14 Incorrect 4 ms 11664 KB Output isn't correct
15 Incorrect 4 ms 11664 KB Output isn't correct
16 Incorrect 4 ms 11664 KB Output isn't correct
17 Correct 5 ms 11664 KB Output is correct
18 Correct 4 ms 11664 KB Output is correct
19 Correct 5 ms 11664 KB Output is correct
20 Correct 4 ms 11664 KB Output is correct
21 Correct 4 ms 11664 KB Output is correct
22 Incorrect 4 ms 11664 KB Output isn't correct
23 Incorrect 68 ms 11664 KB Output isn't correct
24 Incorrect 80 ms 11664 KB Output isn't correct
25 Correct 67 ms 11664 KB Output is correct
26 Correct 4 ms 11664 KB Output is correct
27 Correct 4 ms 11664 KB Output is correct
28 Correct 4 ms 11664 KB Output is correct
29 Correct 4 ms 11664 KB Output is correct
30 Incorrect 91 ms 12572 KB Output isn't correct
31 Incorrect 92 ms 12572 KB Output isn't correct
32 Incorrect 80 ms 12572 KB Output isn't correct
33 Correct 67 ms 12572 KB Output is correct
34 Correct 4 ms 12572 KB Output is correct
35 Correct 4 ms 12572 KB Output is correct
36 Correct 4 ms 12572 KB Output is correct
37 Correct 4 ms 12572 KB Output is correct
38 Incorrect 89 ms 12572 KB Output isn't correct
39 Incorrect 80 ms 12572 KB Output isn't correct
40 Incorrect 88 ms 12572 KB Output isn't correct
41 Correct 80 ms 12572 KB Output is correct
42 Correct 4 ms 12572 KB Output is correct
43 Correct 4 ms 12572 KB Output is correct
44 Correct 4 ms 12572 KB Output is correct
45 Correct 4 ms 12572 KB Output is correct
46 Incorrect 83 ms 12572 KB Output isn't correct
47 Incorrect 77 ms 12572 KB Output isn't correct
48 Incorrect 80 ms 12572 KB Output isn't correct
49 Correct 66 ms 12572 KB Output is correct
50 Correct 4 ms 12572 KB Output is correct
51 Correct 4 ms 12572 KB Output is correct
52 Correct 4 ms 12572 KB Output is correct
53 Correct 4 ms 12572 KB Output is correct
54 Incorrect 72 ms 12572 KB Output isn't correct