結果
| 問題 |
No.408 五輪ピック
|
| ユーザー |
 shimomire
|
| 提出日時 | 2016-08-05 23:32:22 |
| 言語 | C++11（廃止可能性あり） (gcc 13.3.0) |
| 結果 |
AC
|
| 実行時間 | 40 ms / 5,000 ms |
| コード長 | 5,250 bytes |
| コンパイル時間 | 1,152 ms |
| コンパイル使用メモリ | 124,656 KB |
| 実行使用メモリ | 6,820 KB |
| 最終ジャッジ日時 | 2024-11-07 04:16:28 |
| 合計ジャッジ時間 | 2,680 ms |
|
ジャッジサーバーID （参考情報） |
judge1 / judge2 |
（要ログイン）
| ファイルパターン | 結果 |
|---|---|
| other | AC * 32 |
コンパイルメッセージ
main.cpp: In function ‘int main()’:
main.cpp:125:33: warning: ‘vy’ may be used uninitialized in this function [-Wmaybe-uninitialized]
125 | if(vx == vy) continue;
| ^~
main.cpp:124:37: note: ‘vy’ was declared here
124 | int vy;for(int v:ps[y])if(v!=x) vy = v;
| ^~
main.cpp:125:33: warning: ‘vx’ may be used uninitialized in this function [-Wmaybe-uninitialized]
125 | if(vx == vy) continue;
| ^~
main.cpp:123:37: note: ‘vx’ was declared here
123 | int vx;for(int v:ps[x])if(v!=y) vx = v;
| ^~
ソースコード
#include <cassert>// c
#include <iostream>// io
#include <iomanip>
#include <fstream>
#include <sstream>
#include <vector>// container
#include <map>
#include <set>
#include <queue>
#include <bitset>
#include <stack>
#include <algorithm>// other
#include <complex>
#include <numeric>
#include <functional>
#include <random>
#include <regex>
using namespace std;
typedef long long ll;typedef unsigned long long ull;typedef long double ld;
#define ALL(c) c.begin(),c.end()
#define IN(l,v,r) (l<=v && v < r)
template<class T> void UNIQUE(T& v){v.erase(unique(ALL(v)),v.end());}
//debug
#define DUMP(x) cerr << #x <<" = " << (x)
#define LINE() cerr<< " (L" << __LINE__ << ")"
struct range{
struct Iter{
int v,step;
Iter& operator++(){v+=step;return *this;}
bool operator!=(Iter& itr){return v<itr.v;}
int& operator*(){return v;}
};
Iter i, n;
range(int i, int n,int step):i({i,step}), n({n,step}){}
range(int i, int n):range(i,n,1){}
range(int n):range(0,n){}
Iter& begin(){return i;}
Iter& end(){return n;}
};
struct rrange{
struct Iter{
int v,step;
Iter& operator++(){v-=step;return *this;}
bool operator!=(Iter& itr){return v>itr.v;}
int& operator*(){return v;}
};
Iter i, n;
rrange(int i, int n,int step):i({i-1,step}), n({n-1,step}){}
rrange(int i, int n):rrange(i,n,1){}
rrange(int n) :rrange(0,n){}
Iter& begin(){return n;}
Iter& end(){return i;}
};
//input
template<typename T1,typename T2> istream& operator >> (istream& is,pair<T1,T2>& p){return is>>p.first>>p.second;}
template<typename T1> istream& operator >> (istream& is,tuple<T1>& t){return is >> get<0>(t);}
template<typename T1,typename T2> istream& operator >> (istream& is,tuple<T1,T2>& t){return is >> get<0>(t) >> get<1>(t);}
template<typename T1,typename T2,typename T3> istream& operator >> (istream& is,tuple<T1,T2,T3>& t){return is >>get<0>(t)>>get<1>(t)>>get<2>(t);}
template<typename T1,typename T2,typename T3,typename T4> istream& operator >> (istream& is,tuple<T1,T2,T3,T4>& t){return is >> get<0>(t)>>get<1>(t)>>get<2>(t)>>get<3>(t);}
template<typename T> istream& operator >> (istream& is,vector<T>& as){for(int i:range(as.size()))is >>as[i];return is;}
//output
template<typename T> ostream& operator << (ostream& os, const set<T>& ss){for(auto a:ss){if(a!=ss.begin())os<<" "; os<<a;}return os;}
template<typename T1,typename T2> ostream& operator << (ostream& os, const pair<T1,T2>& p){return os<<p.first<<" "<<p.second;}
template<typename K,typename V> ostream& operator << (ostream& os, const map<K,V>& m){bool isF=true;for(auto& p:m){if(!isF)os<<endl;os<<p;isF=false;}return os;}
template<typename T1> ostream& operator << (ostream& os, const tuple<T1>& t){return os << get<0>(t);}
template<typename T1,typename T2> ostream& operator << (ostream& os, const tuple<T1,T2>& t){return os << get<0>(t)<<" "<<get<1>(t);}
template<typename T1,typename T2,typename T3> ostream& operator << (ostream& os, const tuple<T1,T2,T3>& t){return os << get<0>(t)<<" "<<get<1>(t)<<" "<<get<2>(t);}
template<typename T1,typename T2,typename T3,typename T4> ostream& operator << (ostream& os, const tuple<T1,T2,T3,T4>& t){return os << get<0>(t)<<" "<<get<1>(t)<<" "<<get<2>(t)<<" "<<get<3>(t);}
template<typename T> ostream& operator << (ostream& os, const vector<T>& as){for(int i:range(as.size())){if(i!=0)os<<" "; os<<as[i];}return os;}
template<typename T> ostream& operator << (ostream& os, const vector<vector<T>>& as){for(int i:range(as.size())){if(i!=0)os<<endl; os<<as[i];}return os;}
// values
template<typename T> inline T INF(){assert(false);};
template<> inline int INF<int>(){return 1<<28;};
template<> inline ll INF<ll>(){return 1LL<<58;};
template<> inline double INF<double>(){return 1e16;};
template<> inline long double INF<long double>(){return 1e16;};
template<class T> inline T EPS(){assert(false);};
template<> inline int EPS<int>(){return 1;};
template<> inline ll EPS<ll>(){return 1LL;};
template<> inline double EPS<double>(){return 1e-8;};
template<> inline long double EPS<long double>(){return 1e-8;};
// min{2^r | n < 2^r}
template<typename T> T upper_pow2(T n){ T res=1;while(res<n)res<<=1;return res;}
// max{d | 2^d <= n}
template<typename T> T msb(T n){ int d=62;while((1LL<<d)>n)d--;return d;}
template<typename T,typename U> T pmod(T v,U M){return (v%M+M)%M;}
class Main{
public:
// 2
void run(){
int N,M;cin >> N >> M;
vector<vector<int>> g(N);
for(int i:range(M)){
int x,y;cin >> x >> y;x--;y--;
g[x].push_back(y);
g[y].push_back(x);
}
set<int> d1;
for(int v: g[0]) d1.insert(v);
vector<vector<int>> ps(N);
for(int x:range(N))for(int y:g[x]) if(d1.count(y)) ps[x].push_back(y);
int ok = false;
for(int x:range(N))for(int y:g[x]){
if(x == 0 || y == 0)continue;
if(ps[x].size() == 0 || ps[y].size() ==0)continue;
int xc = ps[x].size(), yc = ps[y].size();
if(ps[x][0] == y) xc--;
if(ps[y][0] == x) yc--;
if(xc <= 0 || yc <= 0)continue;
if(xc==1 && yc ==1){
int vx;for(int v:ps[x])if(v!=y) vx = v;
int vy;for(int v:ps[y])if(v!=x) vy = v;
if(vx == vy) continue;
}
ok = true;
}
cout << (ok?"YES":"NO") << endl;
}
};
int main(){
cout <<fixed<<setprecision(20);
cin.tie(0);
ios::sync_with_stdio(false);
Main().run();
return 0;
}