oj.uz

Submission #556540

# Submission time Handle Problem Language Result Execution time Memory
556540 2022-05-03T10:16:14 Z new_acc Pipes (BOI13_pipes) C++14
100 / 100
 197 ms 44264 KB 
#include<bits/stdc++.h>
#define fi first
#define se second
#define pitem item*
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> vi;
typedef vector<ll> vl;
const int N=1e6+10;
const int SS=1<<19;
const int INFi=2e9;
const ll INFl=1e13;
const ll mod2=998244353;
const ll mod=1e9+7;
const ll mod3=1000696969;
const ll p=70032301;
const ull p2=913;
const int L=20;
int t[N],ans[N],val[N];
vector<pair<int,int> >graf[N];
vi __curr;
bool vis[N];
void wa(){
    cout<<0<<"\n";
    exit(0);
}
ll dfs(int v){
    if(vis[v]) return 0;
    vis[v]=1;
    ll sum=0;
    for(auto u:graf[v]){
        ll curr=dfs(u.fi);
        sum+=curr,ans[u.se]=(curr<<1);
    }
    return (ll)t[v]-sum;
}
void dfs2(int v,vi *c,int o,int num){
    if(c->size()) return;
    val[v]=num;
    if(vis[v]){
        c->push_back(v);
        while(__curr[__curr.size()-1]!=v) c->push_back(__curr[__curr.size()-1]),__curr.pop_back();
        return;
    }
    vis[v]=1;
    __curr.push_back(v);
    for(auto u:graf[v]) if(o!=u.fi) dfs2(u.fi,c,v,u.se);
    if(c->size()) return;
    __curr.pop_back();
}
void solve(){
    int n,m;
    cin>>n>>m;
    for(int i=1;i<=n;i++) cin>>t[i];
    for(int a,b,i=1;i<=m;i++){
        cin>>a>>b;
        graf[a].push_back({b,i}),graf[b].push_back({a,i});
    }
    if(m>n) wa();
    if(m==n-1){
        if(dfs(1)) wa();
        for(int i=1;i<=m;i++) cout<<ans[i]<<"\n";
        return;
    }
    vi c;
    dfs2(1,&c,1,0);
    if(!(c.size()&1)) wa();
    reverse(c.begin(),c.end());
    for(int i=1;i<=n;i++) vis[i]=0;
    for(int i=0;i<c.size();i++){
        int pop=(i==0?c[c.size()-1]:c[i-1]),nxt=(i==c.size()-1?c[0]:c[i+1]);
        vis[pop]=1,vis[nxt]=1;
        t[c[i]]=dfs(c[i]);
        vis[pop]=0,vis[nxt]=0;
    }
    ll sum1=0,sum2=0;
    for(int i=1;i<c.size();i+=2) sum1+=(ll)t[c[i]];
    sum1<<=1LL;
    for(int i=0;i<c.size();i++) sum2+=(ll)t[c[i]];
    ans[val[c[0]]]=sum2-sum1;
    if(ans[val[c[0]]]&1LL) wa();
    for(int i=1;i<c.size();i++) ans[val[c[i]]]=(t[c[i-1]]-(ans[val[c[i-1]]]>>1))<<1LL;
    if(t[c[c.size()-1]]!=((ans[val[c[c.size()-1]]]+ans[val[c[0]]])>>1)) wa();
    for(int i=1;i<=m;i++) cout<<ans[i]<<"\n";
}
int main(){
    ios_base::sync_with_stdio(0),cin.tie(0);
    int tt=1;
    while(tt--) solve();
}

Compilation message

pipes.cpp: In function 'void solve()':
pipes.cpp:71:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   71 |     for(int i=0;i<c.size();i++){
      |                 ~^~~~~~~~~
pipes.cpp:72:51: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   72 |         int pop=(i==0?c[c.size()-1]:c[i-1]),nxt=(i==c.size()-1?c[0]:c[i+1]);
      |                                                  ~^~~~~~~~~~~~
pipes.cpp:78:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   78 |     for(int i=1;i<c.size();i+=2) sum1+=(ll)t[c[i]];
      |                 ~^~~~~~~~~
pipes.cpp:80:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   80 |     for(int i=0;i<c.size();i++) sum2+=(ll)t[c[i]];
      |                 ~^~~~~~~~~
pipes.cpp:83:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   83 |     for(int i=1;i<c.size();i++) ans[val[c[i]]]=(t[c[i-1]]-(ans[val[c[i-1]]]>>1))<<1LL;
      |                 ~^~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 23764 KB Output is correct
2 Correct 13 ms 23804 KB Output is correct
3 Correct 13 ms 23804 KB Output is correct
4 Correct 92 ms 30476 KB Output is correct
5 Correct 13 ms 23724 KB Output is correct
6 Correct 12 ms 23764 KB Output is correct
7 Correct 12 ms 23752 KB Output is correct
8 Correct 12 ms 23712 KB Output is correct
9 Correct 13 ms 23828 KB Output is correct
10 Correct 14 ms 23892 KB Output is correct
11 Correct 13 ms 23804 KB Output is correct
12 Correct 17 ms 23892 KB Output is correct
13 Correct 73 ms 29032 KB Output is correct
14 Correct 67 ms 30028 KB Output is correct
15 Correct 73 ms 30384 KB Output is correct
16 Correct 63 ms 29404 KB Output is correct
17 Correct 81 ms 30364 KB Output is correct
18 Correct 75 ms 30388 KB Output is correct
19 Correct 68 ms 32920 KB Output is correct
20 Correct 12 ms 23764 KB Output is correct
21 Correct 14 ms 23784 KB Output is correct
22 Correct 84 ms 30356 KB Output is correct
23 Correct 61 ms 29004 KB Output is correct
24 Correct 69 ms 30412 KB Output is correct
25 Correct 57 ms 29288 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23820 KB Output is correct
2 Correct 15 ms 23892 KB Output is correct
3 Correct 63 ms 32716 KB Output is correct
4 Correct 67 ms 28936 KB Output is correct
5 Correct 54 ms 29156 KB Output is correct
6 Correct 188 ms 44264 KB Output is correct
7 Correct 14 ms 23820 KB Output is correct
8 Correct 13 ms 23732 KB Output is correct
9 Correct 13 ms 23768 KB Output is correct
10 Correct 13 ms 23764 KB Output is correct
11 Correct 13 ms 23764 KB Output is correct
12 Correct 14 ms 23824 KB Output is correct
13 Correct 12 ms 23824 KB Output is correct
14 Correct 13 ms 23816 KB Output is correct
15 Correct 13 ms 23892 KB Output is correct
16 Correct 14 ms 23892 KB Output is correct
17 Correct 14 ms 23892 KB Output is correct
18 Correct 13 ms 23764 KB Output is correct
19 Correct 13 ms 23828 KB Output is correct
20 Correct 17 ms 23784 KB Output is correct
21 Correct 14 ms 23892 KB Output is correct
22 Correct 13 ms 23892 KB Output is correct
23 Correct 76 ms 33136 KB Output is correct
24 Correct 77 ms 34312 KB Output is correct
25 Correct 65 ms 32740 KB Output is correct
26 Correct 54 ms 29004 KB Output is correct
27 Correct 59 ms 28924 KB Output is correct
28 Correct 63 ms 29424 KB Output is correct
29 Correct 158 ms 40452 KB Output is correct
30 Correct 86 ms 36344 KB Output is correct
31 Correct 91 ms 36504 KB Output is correct
32 Correct 80 ms 32092 KB Output is correct
33 Correct 73 ms 33604 KB Output is correct
34 Correct 52 ms 28948 KB Output is correct
35 Correct 68 ms 28948 KB Output is correct
36 Correct 54 ms 29320 KB Output is correct
37 Correct 197 ms 44212 KB Output is correct
38 Correct 83 ms 33760 KB Output is correct
39 Correct 69 ms 31444 KB Output is correct
40 Correct 77 ms 34052 KB Output is correct
41 Correct 68 ms 35984 KB Output is correct
42 Correct 57 ms 28856 KB Output is correct
43 Correct 53 ms 28912 KB Output is correct
44 Correct 53 ms 29216 KB Output is correct
45 Correct 128 ms 41624 KB Output is correct
46 Correct 95 ms 36952 KB Output is correct
47 Correct 86 ms 34108 KB Output is correct
48 Correct 78 ms 36320 KB Output is correct
49 Correct 54 ms 30640 KB Output is correct
50 Correct 53 ms 29032 KB Output is correct
51 Correct 56 ms 29192 KB Output is correct
52 Correct 53 ms 28872 KB Output is correct
53 Correct 154 ms 41732 KB Output is correct
54 Correct 76 ms 35140 KB Output is correct