#include #include #include #include #include #include #include #include #include #include #include #include #define maxn 100007 #define gran 1000007 #define modp 1000000007 #define minn 1007 #define eps (1E-6) #define minf (1E-10) #define infl ((1LL<<62)-1) #define infm ((1<<30)-1) #define lim1 30 #define lim2 300 #define lim3 10000 #define fst first #define scn second using namespace std; typedef long long LL; typedef unsigned long long ULL; const double PI=4*atan(1); const double PI2=PI*2; int n,m,tot,ans; LL N; typedef pair PA; typedef pair PAf; typedef pair PPA; typedef pair TPA; typedef struct sege { int a,c; int nxt; friend int operator<(struct sege x, struct sege y) { return x.a1) ans=1; } printf("%s\n",ans?"YES":"NO"); } return 0; }