oj.uz

Submission #885549

# Submission time Handle Problem Language Result Execution time Memory
885549 2023-12-10T04:38:49 Z 8pete8 Pipes (BOI13_pipes) C++17
100 / 100
 281 ms 42816 KB 
#include<iostream>
#include<stack>
#include<map>
#include<vector>
#include<string>
#include<unordered_map>
#include <queue>
#include<cstring>
#include<limits.h>
#include <cassert>
#include<cmath>
#include<set>
#include<algorithm>
#include <iomanip>
#include<numeric> //gcd(a,b)
#include<bitset>
using namespace std;
#define ll long long
#define f first
#define endl "\n"
#define s second
#define pii pair<int,int>
#define ppii pair<int,pii>
#define vi vector<int>
#define pb push_back
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define F(n) for(int i=0;i<n;i++)
#define lb lower_bound
#define ub upper_bound
#define fastio ios::sync_with_stdio(false);cin.tie(NULL);
#pragma GCC optimize ("03,unroll-loops")
using namespace std;
#define int long long
const int mod=1e9+7,mxn=5e5+5,lg=30,inf=1e18,minf=-1e18;
int ans[mxn+10],val[mxn+10],up[mxn+10],curval[mxn+10];
vector<pii>adj[mxn+10];
bitset<mxn+10>vis;
bool yes=false;
void solve(int cur,int p){
    if(vis[cur])return void(yes=true);
    vis[cur]=true;
    bool leaf=true;
    for(auto i:adj[cur])if(i.f!=p)leaf=false;
    if(leaf){
        ans[up[cur]]+=val[cur];
        curval[p]+=val[cur];
        return;
    }
    for(auto i:adj[cur]){
        if(i.f==p)continue;
        up[i.f]=i.s;
        solve(i.f,cur);
    }
    if(cur==1)return;
    ans[up[cur]]+=(val[cur]-curval[cur]);
    curval[p]+=(val[cur]-curval[cur]);
}
vector<ppii>path;
int deg[mxn+10],sum,cnt=0;
int tin[mxn+10];
int start=1,t=0;
void solve2(int cur,int p){
    if(vis[cur])return;
    cnt++;
    tin[cur]=t++;
    if(cnt%2)sum+=(val[cur]-curval[cur]);
    else sum-=(val[cur]-curval[cur]);
    vis[cur]=true;
    for(auto i:adj[cur]){
        if(i.f==start&&i.f!=p){
            path.pb({i.s,{i.f,cur}});
            return;
        }
        if(i.f!=p&&!vis[i.f]){
            path.pb({i.s,{i.f,cur}});
            solve2(i.f,cur); 
        }
    }
}
int32_t main(){
    int n,m;cin>>n>>m;
    for(int i=1;i<=n;i++)cin>>val[i];
    for(int i=0;i<m;i++){
        int a,b;cin>>a>>b;
        adj[a].pb({b,i});
        adj[b].pb({a,i});
    }
    if(m>n){
        cout<<0;
        return 0;
    }
    if(m==n-1){
        solve(1,-1);
        for(int i=0;i<m;i++)cout<<2*ans[i]<<'\n';
        return 0;
    }
    queue<int>st;
    for(int i=1;i<=n;i++){
        if(adj[i].size()==1)st.push(i);
        deg[i]=adj[i].size();
    }
    cnt=0;
    int add;
    while(!st.empty()){
        vis[st.front()]=true;
        for(auto i:adj[st.front()]){
            if(vis[i.f])continue;
            deg[i.f]--;
            add=val[st.front()]-curval[st.front()];
            ans[i.s]+=add;
            curval[i.f]+=add;
            curval[st.front()]+=add;
            if(deg[i.f]<=1){
                st.push(i.f);
                vis[i.f]=true;
            }
        }
        st.pop();
        cnt++;
    }
    for(int i=1;i<=n;i++)if(!vis[i])start=i;
    for(int i=1;i<=n;i++)if(!vis[i]&&curval[i]!=0)start=i;
    if((n-cnt)%2==0){
        cout<<0;
        return 0;
    }
    cnt=0;
    solve2(start,-1);
    sum/=2;
    reverse(all(path));
    for(int i=0;i<path.size();i++){
        if(i==0)add=sum;
        else add=val[path[i].s.f]-curval[path[i].s.f];
        ans[path[i].f]+=add;
        curval[path[i].s.f]+=add;
        curval[path[i].s.s]+=add;
    }
    /*

    */
    for(int i=0;i<m;i++)cout<<2*ans[i]<<'\n';
}

Compilation message

pipes.cpp: In function 'int32_t main()':
pipes.cpp:132:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, std::pair<long long int, long long int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  132 |     for(int i=0;i<path.size();i++){
      |                 ~^~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 20916 KB Output is correct
2 Correct 4 ms 20828 KB Output is correct
3 Correct 5 ms 20828 KB Output is correct
4 Correct 79 ms 26452 KB Output is correct
5 Correct 4 ms 20828 KB Output is correct
6 Correct 4 ms 20824 KB Output is correct
7 Correct 4 ms 20828 KB Output is correct
8 Correct 4 ms 20964 KB Output is correct
9 Correct 4 ms 20828 KB Output is correct
10 Correct 4 ms 20824 KB Output is correct
11 Correct 4 ms 20828 KB Output is correct
12 Correct 5 ms 20828 KB Output is correct
13 Correct 62 ms 25304 KB Output is correct
14 Correct 76 ms 25952 KB Output is correct
15 Correct 83 ms 26448 KB Output is correct
16 Correct 67 ms 25424 KB Output is correct
17 Correct 79 ms 26452 KB Output is correct
18 Correct 81 ms 26456 KB Output is correct
19 Correct 89 ms 29456 KB Output is correct
20 Correct 4 ms 20828 KB Output is correct
21 Correct 4 ms 20828 KB Output is correct
22 Correct 82 ms 26456 KB Output is correct
23 Correct 63 ms 25304 KB Output is correct
24 Correct 79 ms 26316 KB Output is correct
25 Correct 69 ms 25556 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 20828 KB Output is correct
2 Correct 4 ms 21084 KB Output is correct
3 Correct 78 ms 28260 KB Output is correct
4 Correct 69 ms 22000 KB Output is correct
5 Correct 66 ms 21724 KB Output is correct
6 Correct 276 ms 42772 KB Output is correct
7 Correct 3 ms 20824 KB Output is correct
8 Correct 4 ms 20828 KB Output is correct
9 Correct 4 ms 20828 KB Output is correct
10 Correct 3 ms 16732 KB Output is correct
11 Correct 3 ms 16732 KB Output is correct
12 Correct 3 ms 16732 KB Output is correct
13 Correct 3 ms 16732 KB Output is correct
14 Correct 4 ms 20828 KB Output is correct
15 Correct 4 ms 21176 KB Output is correct
16 Correct 5 ms 20824 KB Output is correct
17 Correct 4 ms 20828 KB Output is correct
18 Correct 3 ms 16732 KB Output is correct
19 Correct 4 ms 16732 KB Output is correct
20 Correct 3 ms 16732 KB Output is correct
21 Correct 4 ms 16988 KB Output is correct
22 Correct 4 ms 21084 KB Output is correct
23 Correct 91 ms 36760 KB Output is correct
24 Correct 94 ms 38148 KB Output is correct
25 Correct 69 ms 27984 KB Output is correct
26 Correct 68 ms 22028 KB Output is correct
27 Correct 70 ms 21844 KB Output is correct
28 Correct 71 ms 22096 KB Output is correct
29 Correct 216 ms 37328 KB Output is correct
30 Correct 93 ms 36828 KB Output is correct
31 Correct 98 ms 42456 KB Output is correct
32 Correct 85 ms 33268 KB Output is correct
33 Correct 74 ms 28240 KB Output is correct
34 Correct 70 ms 21844 KB Output is correct
35 Correct 69 ms 21904 KB Output is correct
36 Correct 69 ms 21844 KB Output is correct
37 Correct 281 ms 42816 KB Output is correct
38 Correct 95 ms 37008 KB Output is correct
39 Correct 83 ms 32340 KB Output is correct
40 Correct 88 ms 37584 KB Output is correct
41 Correct 72 ms 28244 KB Output is correct
42 Correct 70 ms 21928 KB Output is correct
43 Correct 69 ms 21964 KB Output is correct
44 Correct 66 ms 21704 KB Output is correct
45 Correct 215 ms 40504 KB Output is correct
46 Correct 91 ms 36100 KB Output is correct
47 Correct 90 ms 37644 KB Output is correct
48 Correct 94 ms 42444 KB Output is correct
49 Correct 70 ms 27976 KB Output is correct
50 Correct 70 ms 21968 KB Output is correct
51 Correct 77 ms 22096 KB Output is correct
52 Correct 68 ms 21844 KB Output is correct
53 Correct 223 ms 39588 KB Output is correct
54 Correct 91 ms 35844 KB Output is correct