模拟。
#pragma comment(linker, "/STACK:1024000000,1024000000") #include<cstdio> #include<cstring> #include<cmath> #include<algorithm> #include<vector> #include<map> #include<set> #include<queue> #include<stack> #include<ctime> #include<iostream> using namespace std; typedef long long LL; const double pi=acos(-1.0),eps=1e-10; void File() { freopen("D:\\in.txt","r",stdin); freopen("D:\\out.txt","w",stdout); } template <class T> inline void read(T &x) { char c = getchar(); x = 0; while(!isdigit(c)) c = getchar(); while(isdigit(c)) { x = x * 10 + c - ‘0‘; c = getchar(); } } int a[200010],n; int main() { cin>>n; for(int i=1;i<=n;i++) cin>>a[i]; bool fail=0; for(int i=1;i<n;i++) { if(a[i]<0) fail=1; a[i]=a[i]%2; if(a[i]==1) { a[i]--; a[i+1]--; } } a[n]=a[n]%2; if(a[n]!=0) fail=1; if(fail==1) printf("NO\n"); else printf("YES\n"); return 0; }
时间: 2024-09-28 16:14:09