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Codeforces Round #424 (Div....

#include<cstdio> using namespace std; int n,i,la,nw,fl,tp; int main(){ for(scanf("%d%d",&n,&la);++i<n;la=nw,fl=tp) if(scanf("%d",&nw),fl>(tp=(nw>la?0:(nw<la?2:1))))return puts("NO"); return puts("YES"); }

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