oj.uz

Submission #667190

# Submission time Handle Problem Language Result Execution time Memory
667190 2022-11-30T16:39:18 Z ktkerem Network (BOI15_net) C++17
100 / 100
 584 ms 59520 KB 
/*#pragma GCC target ("avx2")
#pragma GCC optimize ("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize ("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")/**/
#include<bits/stdc++.h>
/**/
//typedef int ll;
typedef long long ll;
typedef unsigned long long ull;
typedef std::string str;
//typedef vector<std::vector<ll>> vv; 
/*typedef __int128 vll;
typedef unsigned __int128 uvll;*/
#define llll std::pair<ll , ll>
#define pb push_back
#define pf push_front
#define halo cout << "hello\n"
#define fi first
#define sec second
#define vv(x) std::vector<std::vector<x>>
#define all(a) a.begin() , a.end()
const ll limit = 1e9+7; 
const ll ous = 5e5 + 7;
const ll dx[4] = {-1 , 0 , 1 , 0} , dy[4] = {0,1,0,-1};
template <typename T> std::string type_name();
ll n , m;std::vector<ll> ar;
std::vector<ll> adj[ous] , lc(ous) , v;
ll cnt = 0;
ll finlevcnt(ll crt , ll prv = 0 , ll crp = 0){
    for(auto j:adj[crt]){
        if(j != prv){
            ll o = finlevcnt(j , crt , lc[crt] - lc[j] + crp);
            if(o){
                return o;
            }
        }
    }
    if(adj[crt].size() < 2){
        return 0;
    }
    ll kd = (cnt + 1)/2 >= crp;
    for(auto j:adj[crt]){
        if(kd == 0){
            break;
        }
        if(j != prv){
            if(lc[j] > (cnt + 1)/2){
                kd =0;
            }
        }
    }
    //std::cout << crt << " " << crp << " " << lc[3] << " " << kd << "\n";
    return(kd ?crt :0);
}
ll dfs(ll crt , ll prv){
    ll k = 1;
    for(auto j:adj[crt]){
        if(j != prv){
            k = 0;
            lc[crt] += dfs(j , crt);
        }
    }
    if(k || adj[crt].size() < 2){
        lc[crt] += 1;
        cnt++;
    }
    return lc[crt];
}
void fndlv(ll crt , ll prv){
    if(adj[crt].size() < 2){
        v.pb(crt);
        return;
    }
    for(auto j:adj[crt]){
        if(j != prv){
            fndlv(j , crt);
        }
    }
}
void solve(){
    ll n;std::cin >> n;
    for(ll i = 0;n-1>i;i++){
        ll x , y;std::cin >> x >> y;
        adj[x].pb(y);
        adj[y].pb(x);
    }
    dfs(1 , 0);
    ll o = finlevcnt(1);
    for(auto j:adj[o]){
        fndlv(j , o);
    }
    ll tl = 0;
    //std::cout << o << "\n";
    ll ps = ((cnt + 1) / 2) * 2;
    ll ans [ps];
    for(ll i = 0;ps>i;i++){
        ans[tl] = v[i % v.size()];
        tl+=2;
        if(tl == ps){
            tl = 1;
        }
    }
    std::cout << ps / 2 << "\n";
    for(ll i = 0;ps>i;i+=2){
        std::cout << ans[i] << " " << ans[i+1] << "\n";
    }
    return;/**/
}
signed main(){
    std::ios_base::sync_with_stdio(false);std::cin.tie(NULL);
    ll t=1;
    //std::cin >> t;
    ll o = 1;
    while(t--){ 
        //cout << "Case " << o++ << ":\n";
        solve();
    }
    return 0;
}/**/

Compilation message

net.cpp:5:78: warning: "/*" within comment [-Wcomment]
    5 | #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")/**/
      |                                                                               
net.cpp: In function 'int main()':
net.cpp:114:8: warning: unused variable 'o' [-Wunused-variable]
  114 |     ll o = 1;
      |        ^

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 15956 KB Output is correct
2 Correct 9 ms 15952 KB Output is correct
3 Correct 7 ms 15956 KB Output is correct
4 Correct 8 ms 15984 KB Output is correct
5 Correct 8 ms 15864 KB Output is correct
6 Correct 8 ms 15956 KB Output is correct
7 Correct 9 ms 15956 KB Output is correct
8 Correct 8 ms 15948 KB Output is correct
9 Correct 10 ms 15956 KB Output is correct
10 Correct 8 ms 15956 KB Output is correct
11 Correct 8 ms 15956 KB Output is correct
12 Correct 9 ms 15956 KB Output is correct
13 Correct 8 ms 15956 KB Output is correct
14 Correct 7 ms 15956 KB Output is correct
15 Correct 8 ms 15956 KB Output is correct
16 Correct 7 ms 15968 KB Output is correct
17 Correct 8 ms 15956 KB Output is correct
18 Correct 8 ms 15956 KB Output is correct
19 Correct 8 ms 15956 KB Output is correct
20 Correct 10 ms 15956 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 15956 KB Output is correct
2 Correct 9 ms 15952 KB Output is correct
3 Correct 7 ms 15956 KB Output is correct
4 Correct 8 ms 15984 KB Output is correct
5 Correct 8 ms 15864 KB Output is correct
6 Correct 8 ms 15956 KB Output is correct
7 Correct 9 ms 15956 KB Output is correct
8 Correct 8 ms 15948 KB Output is correct
9 Correct 10 ms 15956 KB Output is correct
10 Correct 8 ms 15956 KB Output is correct
11 Correct 8 ms 15956 KB Output is correct
12 Correct 9 ms 15956 KB Output is correct
13 Correct 8 ms 15956 KB Output is correct
14 Correct 7 ms 15956 KB Output is correct
15 Correct 8 ms 15956 KB Output is correct
16 Correct 7 ms 15968 KB Output is correct
17 Correct 8 ms 15956 KB Output is correct
18 Correct 8 ms 15956 KB Output is correct
19 Correct 8 ms 15956 KB Output is correct
20 Correct 10 ms 15956 KB Output is correct
21 Correct 8 ms 15956 KB Output is correct
22 Correct 9 ms 16048 KB Output is correct
23 Correct 10 ms 16136 KB Output is correct
24 Correct 9 ms 16084 KB Output is correct
25 Correct 9 ms 16084 KB Output is correct
26 Correct 8 ms 15956 KB Output is correct
27 Correct 9 ms 16084 KB Output is correct
28 Correct 11 ms 16084 KB Output is correct
29 Correct 11 ms 16084 KB Output is correct
30 Correct 9 ms 15956 KB Output is correct
31 Correct 11 ms 16048 KB Output is correct
32 Correct 9 ms 15956 KB Output is correct
33 Correct 8 ms 15956 KB Output is correct
34 Correct 8 ms 15956 KB Output is correct
35 Correct 8 ms 15956 KB Output is correct
36 Correct 7 ms 15984 KB Output is correct
37 Correct 9 ms 15956 KB Output is correct
38 Correct 8 ms 15956 KB Output is correct
39 Correct 9 ms 15956 KB Output is correct
40 Correct 8 ms 15932 KB Output is correct
41 Correct 10 ms 15992 KB Output is correct
42 Correct 10 ms 15936 KB Output is correct
43 Correct 9 ms 16016 KB Output is correct
44 Correct 8 ms 15956 KB Output is correct
45 Correct 9 ms 15956 KB Output is correct
46 Correct 9 ms 15992 KB Output is correct
47 Correct 8 ms 15956 KB Output is correct
48 Correct 8 ms 15956 KB Output is correct
49 Correct 8 ms 16020 KB Output is correct
50 Correct 8 ms 15956 KB Output is correct
51 Correct 8 ms 15956 KB Output is correct
52 Correct 8 ms 15956 KB Output is correct
53 Correct 10 ms 15956 KB Output is correct
54 Correct 10 ms 15956 KB Output is correct
55 Correct 9 ms 15992 KB Output is correct
56 Correct 9 ms 15956 KB Output is correct
57 Correct 8 ms 15956 KB Output is correct
58 Correct 8 ms 16084 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 15956 KB Output is correct
2 Correct 9 ms 15952 KB Output is correct
3 Correct 7 ms 15956 KB Output is correct
4 Correct 8 ms 15984 KB Output is correct
5 Correct 8 ms 15864 KB Output is correct
6 Correct 8 ms 15956 KB Output is correct
7 Correct 9 ms 15956 KB Output is correct
8 Correct 8 ms 15948 KB Output is correct
9 Correct 10 ms 15956 KB Output is correct
10 Correct 8 ms 15956 KB Output is correct
11 Correct 8 ms 15956 KB Output is correct
12 Correct 9 ms 15956 KB Output is correct
13 Correct 8 ms 15956 KB Output is correct
14 Correct 7 ms 15956 KB Output is correct
15 Correct 8 ms 15956 KB Output is correct
16 Correct 7 ms 15968 KB Output is correct
17 Correct 8 ms 15956 KB Output is correct
18 Correct 8 ms 15956 KB Output is correct
19 Correct 8 ms 15956 KB Output is correct
20 Correct 10 ms 15956 KB Output is correct
21 Correct 8 ms 15956 KB Output is correct
22 Correct 9 ms 16048 KB Output is correct
23 Correct 10 ms 16136 KB Output is correct
24 Correct 9 ms 16084 KB Output is correct
25 Correct 9 ms 16084 KB Output is correct
26 Correct 8 ms 15956 KB Output is correct
27 Correct 9 ms 16084 KB Output is correct
28 Correct 11 ms 16084 KB Output is correct
29 Correct 11 ms 16084 KB Output is correct
30 Correct 9 ms 15956 KB Output is correct
31 Correct 11 ms 16048 KB Output is correct
32 Correct 9 ms 15956 KB Output is correct
33 Correct 8 ms 15956 KB Output is correct
34 Correct 8 ms 15956 KB Output is correct
35 Correct 8 ms 15956 KB Output is correct
36 Correct 7 ms 15984 KB Output is correct
37 Correct 9 ms 15956 KB Output is correct
38 Correct 8 ms 15956 KB Output is correct
39 Correct 9 ms 15956 KB Output is correct
40 Correct 8 ms 15932 KB Output is correct
41 Correct 10 ms 15992 KB Output is correct
42 Correct 10 ms 15936 KB Output is correct
43 Correct 9 ms 16016 KB Output is correct
44 Correct 8 ms 15956 KB Output is correct
45 Correct 9 ms 15956 KB Output is correct
46 Correct 9 ms 15992 KB Output is correct
47 Correct 8 ms 15956 KB Output is correct
48 Correct 8 ms 15956 KB Output is correct
49 Correct 8 ms 16020 KB Output is correct
50 Correct 8 ms 15956 KB Output is correct
51 Correct 8 ms 15956 KB Output is correct
52 Correct 8 ms 15956 KB Output is correct
53 Correct 10 ms 15956 KB Output is correct
54 Correct 10 ms 15956 KB Output is correct
55 Correct 9 ms 15992 KB Output is correct
56 Correct 9 ms 15956 KB Output is correct
57 Correct 8 ms 15956 KB Output is correct
58 Correct 8 ms 16084 KB Output is correct
59 Correct 402 ms 45108 KB Output is correct
60 Correct 467 ms 47720 KB Output is correct
61 Correct 8 ms 15956 KB Output is correct
62 Correct 10 ms 15900 KB Output is correct
63 Correct 321 ms 41936 KB Output is correct
64 Correct 12 ms 16468 KB Output is correct
65 Correct 17 ms 18440 KB Output is correct
66 Correct 162 ms 37052 KB Output is correct
67 Correct 584 ms 59520 KB Output is correct
68 Correct 584 ms 58720 KB Output is correct
69 Correct 14 ms 17100 KB Output is correct
70 Correct 82 ms 27428 KB Output is correct
71 Correct 294 ms 51228 KB Output is correct
72 Correct 302 ms 49768 KB Output is correct
73 Correct 88 ms 24460 KB Output is correct
74 Correct 480 ms 44748 KB Output is correct
75 Correct 36 ms 19884 KB Output is correct
76 Correct 287 ms 50644 KB Output is correct
77 Correct 279 ms 51216 KB Output is correct
78 Correct 33 ms 19984 KB Output is correct
79 Correct 578 ms 53992 KB Output is correct
80 Correct 9 ms 16212 KB Output is correct
81 Correct 134 ms 27368 KB Output is correct
82 Correct 395 ms 47972 KB Output is correct
83 Correct 501 ms 44756 KB Output is correct
84 Correct 497 ms 44864 KB Output is correct
85 Correct 470 ms 44824 KB Output is correct
86 Correct 470 ms 47644 KB Output is correct
87 Correct 452 ms 47688 KB Output is correct