結果

問題 No.1424 Ultrapalindrome
ユーザー yuto1115yuto1115
提出日時 2021-03-12 21:37:55
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 42 ms / 2,000 ms
コード長 4,247 bytes
コンパイル時間 2,509 ms
コンパイル使用メモリ 204,632 KB
実行使用メモリ 21,760 KB
最終ジャッジ日時 2024-04-22 17:00:49
合計ジャッジ時間 3,714 ms
ジャッジサーバーID
(参考情報)
judge5 / judge3
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 2 ms
5,248 KB
testcase_01 AC 2 ms
5,376 KB
testcase_02 AC 2 ms
5,376 KB
testcase_03 AC 1 ms
5,376 KB
testcase_04 AC 2 ms
5,376 KB
testcase_05 AC 2 ms
5,376 KB
testcase_06 AC 2 ms
5,376 KB
testcase_07 AC 2 ms
5,376 KB
testcase_08 AC 2 ms
5,376 KB
testcase_09 AC 27 ms
7,808 KB
testcase_10 AC 26 ms
8,064 KB
testcase_11 AC 18 ms
6,912 KB
testcase_12 AC 25 ms
7,680 KB
testcase_13 AC 8 ms
5,376 KB
testcase_14 AC 20 ms
7,040 KB
testcase_15 AC 2 ms
5,376 KB
testcase_16 AC 17 ms
6,272 KB
testcase_17 AC 20 ms
6,940 KB
testcase_18 AC 15 ms
5,888 KB
testcase_19 AC 25 ms
6,912 KB
testcase_20 AC 7 ms
5,376 KB
testcase_21 AC 20 ms
6,400 KB
testcase_22 AC 12 ms
5,376 KB
testcase_23 AC 3 ms
5,376 KB
testcase_24 AC 7 ms
5,376 KB
testcase_25 AC 6 ms
5,376 KB
testcase_26 AC 31 ms
7,424 KB
testcase_27 AC 42 ms
9,876 KB
testcase_28 AC 42 ms
21,760 KB
testcase_29 AC 41 ms
21,760 KB
testcase_30 AC 26 ms
10,008 KB
testcase_31 AC 30 ms
10,320 KB
権限があれば一括ダウンロードができます

ソースコード

diff #

//@formatter:off
#include<bits/stdc++.h>
#define overload4(_1,_2,_3,_4,name,...) name
#define rep1(i,n) for (ll i = 0; i < ll(n); ++i)
#define rep2(i,s,n) for (ll i = ll(s); i < ll(n); ++i)
#define rep3(i,s,n,d) for(ll i = ll(s); i < ll(n); i+=d)
#define rep(...) overload4(__VA_ARGS__,rep3,rep2,rep1)(__VA_ARGS__)
#define rrep1(i,n) for (ll i = ll(n)-1; i >= 0; i--)
#define rrep2(i,n,t) for (ll i = ll(n)-1; i >= (ll)t; i--)
#define rrep3(i,n,t,d) for (ll i = ll(n)-1; i >= (ll)t; i-=d)
#define rrep(...) overload4(__VA_ARGS__,rrep3,rrep2,rrep1)(__VA_ARGS__)
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define popcount(x) __builtin_popcount(x)
#define pb push_back
#define eb emplace_back
#ifdef __LOCAL
#define debug(...) { cout << #__VA_ARGS__; cout << ": "; print(__VA_ARGS__); cout << flush; }
#else
#define debug(...) void(0)
#endif
#define INT(...) int __VA_ARGS__;scan(__VA_ARGS__)
#define LL(...) ll __VA_ARGS__;scan(__VA_ARGS__)
#define STR(...) string __VA_ARGS__;scan(__VA_ARGS__)
#define CHR(...) char __VA_ARGS__;scan(__VA_ARGS__)
#define DBL(...) double __VA_ARGS__;scan(__VA_ARGS__)
#define LD(...) ld __VA_ARGS__;scan(__VA_ARGS__)
using namespace std;
using ll = long long;
using ld = long double;
using P = pair<int,int>;
using LP = pair<ll,ll>;
using vi = vector<int>;
using vvi = vector<vector<int>>;
using vl = vector<ll>;
using vvl = vector<vector<ll>>;
using vd = vector<double>;
using vvd = vector<vector<double>>;
using vs = vector<string>;
using vc = vector<char>;
using vvc = vector<vector<char>>;
using vb = vector<bool>;
using vvb = vector<vector<bool>>;
using vp = vector<P>;
using vvp = vector<vector<P>>;
template<class S,class T> istream& operator>>(istream &is,pair<S,T> &p) { return is >> p.first >> p.second; }
template<class S,class T> ostream& operator<<(ostream &os,const pair<S,T> &p) { return os<<'{'<<p.first<<","<<p.second<<'}'; }
template<class T> istream& operator>>(istream &is,vector<T> &v) { for(T &t:v){is>>t;} return is; }
template<class T> ostream& operator<<(ostream &os,const vector<T> &v) { os<<'[';rep(i,v.size())os<<v[i]<<(i==int(v.size()-1)?"":","); return os<<']'; }
template<class T> void vecout(const vector<T> &v,char div='\n') { rep(i,v.size()) cout<<v[i]<<(i==int(v.size()-1)?'\n':div);}
template<class T> bool chmin(T& a,T b) {if(a > b){a = b; return true;} return false;}
template<class T> bool chmax(T& a,T b) {if(a < b){a = b; return true;} return false;}
void scan(){}
template <class Head, class... Tail> void scan(Head& head, Tail&... tail){ cin >> head; scan(tail...); }
template<class T> void print(const T& t){ cout << t << '\n'; }
template <class Head, class... Tail> void print(const Head& head, const Tail&... tail){ cout<<head<<' '; print(tail...); }
template<class... T> void fin(const T&... a) { print(a...); exit(0); }
const string yes[] = {"no","yes"};
const string Yes[] = {"No","Yes"};
const string YES[] = {"NO","YES"};
const int inf = 1001001001;
const ll linf = 1001001001001001001;
//@formatter:on

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    INT(n);
    vvi G(n);
    vi deg(n);
    rep(_, n - 1) {
        INT(a, b);
        a--, b--;
        G[a].pb(b);
        G[b].pb(a);
        deg[a]++;
        deg[b]++;
    }
    if (n == 2) fin("Yes");
    int r = -1;
    rep(i, n) if (deg[i] > 1) r = i;
    assert(r != -1);
    int len = -1;
    auto dfs = [&](auto &dfs, int u, int p) -> int {
        vi ls;
        for (int v : G[u]) {
            if (v == p) continue;
            ls.pb(dfs(dfs, v, u));
        }
        if (ls.size() == 0) return 0;
        if (ls.size() == 1) return (ls[0] >= 0 ? ls[0] + 1 : -1);
        if (any_of(all(ls), [&](int i) { return i == -1; })) fin("No");
        if (ls.size() == 2) {
            int now = ls[0] + ls[1] + 2;
            if (len != -1 and len != now) fin("No");
            len = now;
            return (ls[0] == ls[1] ? ls[0] + 1 : -1);
        } else {
            sort(all(ls));
            if (ls[0] != ls.back()) fin("No");
            int now = (ls[0] + 1) * 2;
            if (len != -1 and len != now) fin("No");
            len = now;
            return now / 2;
        }
    };
    dfs(dfs, r, -1);
    fin("Yes");
}
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