Language: C++

#include <bits/stdc++.h>
using namespace std;
using namespace std::chrono;
using ll=long long;
using ull=unsigned long long;
using uint=unsigned int;
using pcc=pair<char,char>;
using pii=pair<int,int>;
using pll=pair<ll,ll>;
using pdd=pair<double,double>;
using tuplis=pair<ll,pll>;
template<class T> using pq=priority_queue<T,vector<T>,greater<T>>;
const ll LINF=0x1fffffffffffffff;
const ll MOD=1000000007;
const ll MODD=0x3b800001;
const int INF=0x3fffffff;
const double DINF=numeric_limits<double>::infinity();
const vector<pii> four={{-1,0},{0,1},{1,0},{0,-1}};
#define _overload4(_1,_2,_3,_4,name,...) name
#define _overload3(_1,_2,_3,name,...) name
#define _rep1(n) _rep2(i,n)
#define _rep2(i,n) _rep3(i,0,n)
#define _rep3(i,a,b) for(ll i=a;i<b;++i)
#define _rep4(i,a,b,c) for(ll i=a;i<b;i+=c)
#define rep(...) _overload4(__VA_ARGS__,_rep4,_rep3,_rep2,_rep1)(__VA_ARGS__)
#define _rrep1(n) _rrep2(i,n)
#define _rrep2(i,n) _rrep3(i,0,n)
#define _rrep3(i,a,b) for(ll i=b-1;i>=a;i--)
#define _rrep4(i,a,b,c) for(ll i=a+(b-a-1)/c*c;i>=a;i-=c)
#define rrep(...) _overload4(__VA_ARGS__,_rrep4,_rrep3,_rrep2,_rrep1)(__VA_ARGS__)
#define each(i,a) for(auto&& i:a)
#define sum(...) accumulate(range(__VA_ARGS__),0LL)
#define dsum(...) accumulate(range(__VA_ARGS__),double(0))
#define _range(i) (i).begin(),(i).end()
#define _range2(i,k) (i).begin(),(i).begin()+k
#define _range3(i,a,b) (i).begin()+a,(i).begin()+b
#define range(...) _overload3(__VA_ARGS__,_range3,_range2,_range)(__VA_ARGS__)
#define _rrange(i) (i).rbegin(),(i).rend()
#define _rrange2(i,k) (i).rbegin(),(i).rbegin()+k
#define _rrange3(i,a,b) (i).rbegin()+a,(i).rbegin()+b
#define rrange(...) _overload3(__VA_ARGS__,_rrange3,_rrange2,_rrange)(__VA_ARGS__)
#define yes(i) out(i?"yes":"no")
#define Yes(i) out(i?"Yes":"No")
#define YES(i) out(i?"YES":"NO")
#define Possible(i) out(i?"Possible":"Impossible")
#define elif else if
#define unless(a) if(!(a))
#define mp make_pair
#define mt make_tuple
#define INT(...) int __VA_ARGS__;in(__VA_ARGS__)
#define LL(...) ll __VA_ARGS__;in(__VA_ARGS__)
#define STR(...) string __VA_ARGS__;in(__VA_ARGS__)
#define CHR(...) char __VA_ARGS__;in(__VA_ARGS__)
#define DBL(...) double __VA_ARGS__;in(__VA_ARGS__)
#define vec(type,name,...) vector<type> name(__VA_ARGS__)
#define VEC(type,name,size) vector<type> name(size);in(name)
#define vv(type,name,h,...) vector<vector<type>>name(h,vector<type>(__VA_ARGS__))
#define VV(type,name,h,...) vector<vector<type>>name(h,vector<type>(__VA_ARGS__));in(name)
#define vvv(type,name,h,w,...) vector<vector<vector<type>>>name(h,vector<vector<type>>(w,vector<type>(__VA_ARGS__)))
__attribute__((constructor)) void SETTINGS(){cin.tie(0); cout.tie(0); ios::sync_with_stdio(0); cout<<fixed<<setprecision(20);};
template<class T>
inline constexpr T gcd (T a,T b) {if(!a||!b)return 0;return a%b?gcd(b,a%b):b;}
template<class T>
inline constexpr T lcm (T a,T b) {return a*b/gcd(a,b);}
template<class T>
inline constexpr T min(vector<T>& v){return *min_element(range(v));}
inline char min(string& v){return *min_element(range(v));}
template<class T>
inline constexpr T max(vector<T>& v){return *max_element(range(v));}
inline char max(string& v){return *max_element(range(v));}
inline ll pow(ll a,ll b){if(b==0)return 1;ll ans=pow(a,b/2);return ans*ans*(b&1?a:1);}
inline ll modpow(ll a,ll b,ll mod){if(b==0)return 1;ll ans=pow(a,b/2);return ans*ans*(b&1?a:1)%mod;}
template<typename T>
inline bool update_min(T& mn,const T& cnt){if(mn>cnt){mn=cnt;return 1;}else return 0;}
template<typename T>
inline bool update_max(T& mx,const T& cnt){if(mx<cnt){mx=cnt;return 1;}else return 0;}
inline void in() {}
template<class T>
istream& operator >> (istream& is, vector<T>& vec);
template<class T,size_t size>
istream& operator >> (istream& is, array<T,size>& vec);
template<class T,class L>
istream& operator >> (istream& is, pair<T,L>& p);
template<class T>
ostream& operator << (ostream& os, vector<T>& vec);
template<class T,class L>
ostream& operator << (ostream& os, pair<T,L>& p);
template<class T>
istream& operator >> (istream& is, vector<T>& vec){for(T& x: vec) is >> x;return is;}
template<class T,class L>
istream& operator >> (istream& is, pair<T,L>& p){is >> p.first;is >> p.second;return is;}
template<class T>
ostream& operator << (ostream& os, vector<T>& vec){os << vec[0];rep(i,1,vec.size()){os << ' ' << vec[i];}return os;}
template<class T>
ostream& operator << (ostream& os, deque<T>& deq){os << deq[0];rep(i,1,deq.size()){os << ' ' << deq[i];}return os;}
template<class T,class L>
ostream& operator << (ostream& os, pair<T,L>& p){os << p.first << " " << p.second;return os;}
template<class T,class L>
pair<T,L> operator + (pair<T,L> a, pair<T,L> b){return {a.first + b.first, a.second + b.second};}
template<class T,class L>
pair<T,L> operator +=(pair<T,L> a, pair<T,L> b){a.first += b.first; a.second += b.second; return a;}
template <class Head, class... Tail>
inline void in(Head&& head,Tail&&... tail){cin>>head;in(move(tail)...);}
template <class T>
inline bool out(T t){cout<<t<<'\n';return 0;}
inline bool out(){cout<<'\n';return 0;}
template <class Head, class... Tail>
inline bool out(Head head,Tail... tail){cout<<head<<' ';out(move(tail)...);return 0;}
template <class T>
inline void err(T t){cerr<<t<<'\n';}
inline void err(){cerr<<'\n';}
template <class Head, class... Tail>
inline void err(Head head,Tail... tail){cerr<<head<<' ';out(move(tail)...);}




signed main(){
    LL(n,k);
    YES((n+1)/2>=k);
}






#include <bits/stdc++.h>
using namespace std;
using namespace std::chrono;
using ll=long long;
using ull=unsigned long long;
using uint=unsigned int;
using pcc=pair<char,char>;
using pii=pair<int,int>;
using pll=pair<ll,ll>;
using pdd=pair<double,double>;
using tuplis=pair<ll,pll>;
template<class T> using pq=priority_queue<T,vector<T>,greater<T>>;
const ll LINF=0x1fffffffffffffff;
const ll MOD=1000000007;
const ll MODD=0x3b800001;
const int INF=0x3fffffff;
const double DINF=numeric_limits<double>::infinity();
const vector<pii> four={{-1,0},{0,1},{1,0},{0,-1}};
#define _overload4(_1,_2,_3,_4,name,...) name
#define _overload3(_1,_2,_3,name,...) name
#define _rep1(n) _rep2(i,n)
#define _rep2(i,n) _rep3(i,0,n)
#define _rep3(i,a,b) for(ll i=a;i<b;++i)
#define _rep4(i,a,b,c) for(ll i=a;i<b;i+=c)
#define rep(...) _overload4(__VA_ARGS__,_rep4,_rep3,_rep2,_rep1)(__VA_ARGS__)
#define _rrep1(n) _rrep2(i,n)
#define _rrep2(i,n) _rrep3(i,0,n)
#define _rrep3(i,a,b) for(ll i=b-1;i>=a;i--)
#define _rrep4(i,a,b,c) for(ll i=a+(b-a-1)/c*c;i>=a;i-=c)
#define rrep(...) _overload4(__VA_ARGS__,_rrep4,_rrep3,_rrep2,_rrep1)(__VA_ARGS__)
#define each(i,a) for(auto&& i:a)
#define sum(...) accumulate(range(__VA_ARGS__),0LL)
#define dsum(...) accumulate(range(__VA_ARGS__),double(0))
#define _range(i) (i).begin(),(i).end()
#define _range2(i,k) (i).begin(),(i).begin()+k
#define _range3(i,a,b) (i).begin()+a,(i).begin()+b
#define range(...) _overload3(__VA_ARGS__,_range3,_range2,_range)(__VA_ARGS__)
#define _rrange(i) (i).rbegin(),(i).rend()
#define _rrange2(i,k) (i).rbegin(),(i).rbegin()+k
#define _rrange3(i,a,b) (i).rbegin()+a,(i).rbegin()+b
#define rrange(...) _overload3(__VA_ARGS__,_rrange3,_rrange2,_rrange)(__VA_ARGS__)
#define yes(i) out(i?"yes":"no")
#define Yes(i) out(i?"Yes":"No")
#define YES(i) out(i?"YES":"NO")
#define Possible(i) out(i?"Possible":"Impossible")
#define elif else if
#define unless(a) if(!(a))
#define mp make_pair
#define mt make_tuple
#define INT(...) int __VA_ARGS__;in(__VA_ARGS__)
#define LL(...) ll __VA_ARGS__;in(__VA_ARGS__)
#define STR(...) string __VA_ARGS__;in(__VA_ARGS__)
#define CHR(...) char __VA_ARGS__;in(__VA_ARGS__)
#define DBL(...) double __VA_ARGS__;in(__VA_ARGS__)
#define vec(type,name,...) vector<type> name(__VA_ARGS__)
#define VEC(type,name,size) vector<type> name(size);in(name)
#define vv(type,name,h,...) vector<vector<type>>name(h,vector<type>(__VA_ARGS__))
#define VV(type,name,h,...) vector<vector<type>>name(h,vector<type>(__VA_ARGS__));in(name)
#define vvv(type,name,h,w,...) vector<vector<vector<type>>>name(h,vector<vector<type>>(w,vector<type>(__VA_ARGS__)))
__attribute__((constructor)) void SETTINGS(){cin.tie(0); cout.tie(0); ios::sync_with_stdio(0); cout<<fixed<<setprecision(20);};
template<class T>
inline constexpr T gcd (T a,T b) {if(!a||!b)return 0;return a%b?gcd(b,a%b):b;}
template<class T>
inline constexpr T lcm (T a,T b) {return a*b/gcd(a,b);}
template<class T>
inline constexpr T min(vector<T>& v){return *min_element(range(v));}
inline char min(string& v){return *min_element(range(v));}
template<class T>
inline constexpr T max(vector<T>& v){return *max_element(range(v));}
inline char max(string& v){return *max_element(range(v));}
inline ll pow(ll a,ll b){if(b==0)return 1;ll ans=pow(a,b/2);return ans*ans*(b&1?a:1);}
inline ll modpow(ll a,ll b,ll mod){if(b==0)return 1;ll ans=pow(a,b/2);return ans*ans*(b&1?a:1)%mod;}
template<typename T>
inline bool update_min(T& mn,const T& cnt){if(mn>cnt){mn=cnt;return 1;}else return 0;}
template<typename T>
inline bool update_max(T& mx,const T& cnt){if(mx<cnt){mx=cnt;return 1;}else return 0;}
inline void in() {}
template<class T>
istream& operator >> (istream& is, vector<T>& vec);
template<class T,size_t size>
istream& operator >> (istream& is, array<T,size>& vec);
template<class T,class L>
istream& operator >> (istream& is, pair<T,L>& p);
template<class T>
ostream& operator << (ostream& os, vector<T>& vec);
template<class T,class L>
ostream& operator << (ostream& os, pair<T,L>& p);
template<class T>
istream& operator >> (istream& is, vector<T>& vec){for(T& x: vec) is >> x;return is;}
template<class T,class L>
istream& operator >> (istream& is, pair<T,L>& p){is >> p.first;is >> p.second;return is;}
template<class T>
ostream& operator << (ostream& os, vector<T>& vec){os << vec[0];rep(i,1,vec.size()){os << ' ' << vec[i];}return os;}
template<class T>
ostream& operator << (ostream& os, deque<T>& deq){os << deq[0];rep(i,1,deq.size()){os << ' ' << deq[i];}return os;}
template<class T,class L>
ostream& operator << (ostream& os, pair<T,L>& p){os << p.first << " " << p.second;return os;}
template<class T,class L>
pair<T,L> operator + (pair<T,L> a, pair<T,L> b){return {a.first + b.first, a.second + b.second};}
template<class T,class L>
pair<T,L> operator +=(pair<T,L> a, pair<T,L> b){a.first += b.first; a.second += b.second; return a;}
template <class Head, class... Tail>
inline void in(Head&& head,Tail&&... tail){cin>>head;in(move(tail)...);}
template <class T>
inline bool out(T t){cout<<t<<'\n';return 0;}
inline bool out(){cout<<'\n';return 0;}
template <class Head, class... Tail>
inline bool out(Head head,Tail... tail){cout<<head<<' ';out(move(tail)...);return 0;}
template <class T>
inline void err(T t){cerr<<t<<'\n';}
inline void err(){cerr<<'\n';}
template <class Head, class... Tail>
inline void err(Head head,Tail... tail){cerr<<head<<' ';out(move(tail)...);}




signed main(){
    LL(n,k);
    YES((n+1)/2>=k);
}








Compiler output:
a.cc:140:10: error: redefinition of 'const ll LINF'
  140 | const ll LINF=0x1fffffffffffffff;
      |          ^~~~
a.cc:13:10: note: 'const ll LINF' previously defined here
   13 | const ll LINF=0x1fffffffffffffff;
      |          ^~~~
a.cc:141:10: error: redefinition of 'const ll MOD'
  141 | const ll MOD=1000000007;
      |          ^~~
a.cc:14:10: note: 'const ll MOD' previously defined here
   14 | const ll MOD=1000000007;
      |          ^~~
a.cc:142:10: error: redefinition of 'const ll MODD'
  142 | const ll MODD=0x3b800001;
      |          ^~~~
a.cc:15:10: note: 'const ll MODD' previously defined here
   15 | const ll MODD=0x3b800001;
      |          ^~~~
a.cc:143:11: error: redefinition of 'const int INF'
  143 | const int INF=0x3fffffff;
      |           ^~~
a.cc:16:11: note: 'const int INF' previously defined here
   16 | const int INF=0x3fffffff;
      |           ^~~
a.cc:144:14: error: redefinition of 'const double DINF'
  144 | const double DINF=numeric_limits<double>::infinity();
      |              ^~~~
a.cc:17:14: note: 'const double DINF' previously defined here
   17 | const double DINF=numeric_limits<double>::infinity();
      |              ^~~~
a.cc:145:19: error: redefinition of 'const std::vector<std::pair<int, int> > four'
  145 | const vector<pii> four={{-1,0},{0,1},{1,0},{0,-1}};
      |                   ^~~~
a.cc:18:19: note: 'const std::vector<std::pair<int, int> > four' previously declared here
   18 | const vector<pii> four={{-1,0},{0,1},{1,0},{0,-1}};
      |                   ^~~~
a.cc:187:35: error: redefinition of 'void SETTINGS()'
  187 | __attribute__((constructor)) void SETTINGS(){cin.tie(0); cout.tie(0); ios::sync_with_stdio(0); cout<<fixed<<setprecision(20);};
      |                                   ^~~~~~~~
a.cc:60:35: note: 'void SETTINGS()' previously defined here
   60 | __attribute__((constructor)) void SETTINGS(){cin.tie(0); cout.tie(0); ios::sync_with_stdio(0); cout<<fixed<<setprecision(20);};
      |                                   ^~~~~~~~
a.cc:189:20: error: redefinition of 'template<class T> constexpr T gcd(T, T)'
  189 | inline constexpr T gcd (T a,T b) {if(!a||!b)return 0;return a%b?gcd(b,a%b):b;}
      |                    ^~~
a.cc:62:20: note: 'template<class T> constexpr T gcd(T, T)' previously declared here
   62 | inline constexpr T gcd (T a,T b) {if(!a||!b)return 0;return a%b?gcd(b,a%b):b;}
      |                    ^~~
a.cc:191:20: error: redefinition of 'template<class T> constexpr T lcm(T, T)'
  191 | inline constexpr T lcm (T a,T b) {return a*b/gcd(a,b);}
      |                    ^~~
a.cc:64:20: note: 'template<class T> constexpr T lcm(T, T)' previously declared here
   64 | inline constexpr T lcm (T a,T b) {return a*b/gcd(a,b);}
      |                    ^~~
a.cc:193:20: error: redefinition of 'template<class T> constexpr T min(std::vector<_Tp>&)'
  193 | inline constexpr T min(vector<T>& v){return *min_element(range(v));}
      |                    ^~~
a.cc:66:20: note: 'template<class T> constexpr T min(std::vector<_Tp>&)' previously declared here
   66 | inline constexpr T min(vector<T>& v){return *min_element(range(v));}
      |                    ^~~
a.cc:194:13: error: redefinition of 'char min(std::string&)'
  194 | inline char min(string& v){return *min_element(range(v));}
      |             ^~~
a.cc:67:13: note: 'char min(std::string&)' previously defined here
   67 | inline char min(string& v){return *min_element(range(v));}
      |             ^~~
a.cc:196:20: error: redefinition of 'template<class T> constexpr T max(std::vector<_Tp>&)'
  196 | inline constexpr T max(vector<T>& v){return *max_element(range(v));}
      |                    ^~~
a.cc:69:20: note: 'template<class T> constexpr T max(std::vector<_Tp>&)' previously declared here
   69 | inline constexpr T max(vector<T>& v){return *max_element(range(v));}
      |                    ^~~
a.cc:197:13: error: redefinition of 'char max(std::string&)'
  197 | inline char max(string& v){return *max_element(range(v));}
      |             ^~~
a.cc:70:13: note: 'char max(std::string&)' previously defined here
   70 | inline char max(string& v){return *max_element(range(v));}
      |             ^~~
a.cc:198:11: error: redefinition of 'll pow(ll, ll)'
  198 | inline ll pow(ll a,ll b){if(b==0)return 1;ll ans=pow(a,b/2);return ans*ans*(b&1?a:1);}
      |           ^~~
a.cc:71:11: note: 'll pow(ll, ll)' previously defined here
   71 | inline ll pow(ll a,ll b){if(b==0)return 1;ll ans=pow(a,b/2);return ans*ans*(b&1?a:1);}
      |           ^~~
a.cc:199:11: error: redefinition of 'll modpow(ll, ll, ll)'
  199 | inline ll modpow(ll a,ll b,ll mod){if(b==0)return 1;ll ans=pow(a,b/2);return ans*ans*(b&1?a:1)%mod;}
      |           ^~~~~~
a.cc:72:11: note: 'll modpow(ll, ll, ll)' previously defined here
   72 | inline ll modpow(ll a,ll b,ll mod){if(b==0)return 1;ll ans=pow(a,b/2);return ans*ans*(b&1?a:1)%mod;}
      |           ^~~~~~
a.cc:201:13: error: redefinition of 'template<class T> bool update_min(T&, const T&)'
  201 | inline bool update_min(T& mn,const T& cnt){if(mn>cnt){mn=cnt;return 1;}else return 0;}
      |             ^~~~~~~~~~
a.cc:74:13: note: 'template<class T> bool update_min(T&, const T&)' previously declared here
   74 | inline bool update_min(T& mn,const T& cnt){if(mn>cnt){mn=cnt;return 1;}else return 0;}
      |             ^~~~~~~~~~
a.cc:203:13: error: redefinition of 'template<class T> bool update_max(T&, const T&)'
  203 | inline bool update_max(T& mx,const T& cnt){if(mx<cnt){mx=cnt;return 1;}else return 0;}
      |             ^~~~~~~~~~
a.cc:76:13: note: 'template<class T> bool update_max(T&, const T&)' previously declared here
   76 | inline bool update_max(T& mx,const T& cnt){if(mx<cnt){mx=cnt;return 1;}else return 0;}
      |             ^~~~~~~~~~
a.cc:204:13: error: redefinition of 'void in()'
  204 | inline void in() {}
      |             ^~
a.cc:77:13: note: 'void in()' previously defined here
   77 | inline void in() {}
      |             ^~
a.cc:216:10: error: redefinition of 'template<class T> std::istream& operator>>(std::istream&, std::vector<_Tp>&)'
  216 | istream& operator >> (istream& is, vector<T>& vec){for(T& x: vec) is >> x;return is;}
      |          ^~~~~~~~
a.cc:89:10: note: 'template<class T> std::istream& operator>>(std::istream&, std::vector<_Tp>&)' previously declared here
   89 | istream& operator >> (istream& is, vector<T>& vec){for(T& x: vec) is >> x;return is;}
      |          ^~~~~~~~
a.cc:218:10: error: redefinition of 'template<class T, class L> std::istream& operator>>(std::istream&, std::pair<_T1, _T2>&)'
  218 | istream& operator >> (istream& is, pair<T,L>& p){is >> p.first;is >> p.second;return is;}
      |          ^~~~~~~~
a.cc:91:10: note: 'template<class T, class L> std::istream& operator>>(std::istream&, std::pair<_T1, _T2>&)' previously declared here
   91 | istream& operator >> (istream& is, pair<T,L>& p){is >> p.first;is >> p.second;return is;}
      |          ^~~~~~~~
a.cc:220:10: error: redefinition of 'template<class T> std::ostream& operator<<(std::ostream&, std::vector<_Tp>&)'
  220 | ostream& operator << (ostream& os, vector<T>& vec){os << vec[0];rep(i,1,vec.size()){os << ' ' << vec[i];}return os;}
      |          ^~~~~~~~
a.cc:93:10: note: 'template<class T> std::ostream& operator<<(std::ostream&, std::vector<_Tp>&)' previously declared here
   93 | ostream& operator << (ostream& os, vector<T>& vec){os << vec[0];rep(i,1,vec.size()){os << ' ' << vec[i];}return os;}
      |          ^~~~~~~~
a.cc:222:10: error: redefinition of 'template<class T> std::ostream& operator<<(std::ostream&, std::deque<_Tp>&)'
  222 | ostream& operator << (ostream& os, deque<T>& deq){os << deq[0];rep(i,1,deq.size()){os << ' ' << deq[i];}return os;}
      |          ^~~~~~~~
a.cc:95:10: note: 'template<class T> std::ostream& operator<<(std::ostream&, std::deque<_Tp>&)' previously declared here
   95 | ostream& operator << (ostream& os, deque<T>& deq){os << deq[0];rep(i,1,deq.size()){os << ' ' << deq[i];}return os;}
      |          ^~~~~~~~
a.cc:224:10: error: redefinition of 'template<class T, class L> std::ostream& operator<<(std::ostream&, std::pair<_T1, _T2>&)'
  224 | ostream& operator << (ostream& os, pair<T,L>& p){os << p.first << " " << p.second;return os;}
      |          ^~~~~~~~
a.cc:97:10: note: 'template<class T, class L> std::ostream& operator<<(std::ostream&, std::pair<_T1, _T2>&)' previously declared here
   97 | ostream& operator << (ostream& os, pair<T,L>& p){os << p.first << " " << p.second;return os;}
      |          ^~~~~~~~
a.cc:226:11: error: redefinition of 'template<class T, class L> std::pair<_T1, _T2> operator+(std::pair<_T1, _T2>, std::pair<_T1, _T2>)'
  226 | pair<T,L> operator + (pair<T,L> a, pair<T,L> b){return {a.first + b.first, a.second + b.second};}
      |           ^~~~~~~~
a.cc:99:11: note: 'template<class T, class L> std::pair<_T1, _T2> operator+(std::pair<_T1, _T2>, std::pair<_T1, _T2>)' previously declared here
   99 | pair<T,L> operator + (pair<T,L> a, pair<T,L> b){return {a.first + b.first, a.second + b.second};}
      |           ^~~~~~~~
a.cc:228:11: error: redefinition of 'template<class T, class L> std::pair<_T1, _T2> operator+=(std::pair<_T1, _T2>, std::pair<_T1, _T2>)'
  228 | pair<T,L> operator +=(pair<T,L> a, pair<T,L> b){a.first += b.first; a.second += b.second; return a;}
      |           ^~~~~~~~
a.cc:101:11: note: 'template<class T, class L> std::pair<_T1, _T2> operator+=(std::pair<_T1, _T2>, std::pair<_T1, _T2>)' previously declared here
  101 | pair<T,L> operator +=(pair<T,L> a, pair<T,L> b){a.first += b.first; a.second += b.second; return a;}
      |           ^~~~~~~~
a.cc:230:13: error: redefinition of 'template<class Head, class ... Tail> void in(Head&&, Tail&& ...)'
  230 | inline void in(Head&& head,Tail&&... tail){cin>>head;in(move(tail)...);}
      |             ^~
a.cc:103:13: note: 'template<class Head, class ... Tail> void in(Head&&, Tail&& ...)' previously declared here
  103 | inline void in(Head&& head,Tail&&... tail){cin>>head;in(move(tail)...);}
      |             ^~
a.cc:232:13: error: redefinition of 'template<class T> bool out(T)'
  232 | inline bool out(T t){cout<<t<<'\n';retur