31 lines
607 B
C++
31 lines
607 B
C++
#include <iostream>
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using namespace std;
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int main()
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{
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int n, ans = 0, k = 0, a[21] = { 0 };
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cin >> n;
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for (int i = 1; i <= n; i++) {
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cin >> a[i];
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}
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for(int i=1;i<=n;i++){
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if(a[i]==0){
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if(i%2==0){
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cout<<"YES";
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return 0;
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}
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break;
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}
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}
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for (int i = n; i >= 1; i--) {
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k=n-i+1;
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if (a[i] == 0) {
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if (k % 2 == 0) {
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cout<<"YES";
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return 0;
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}
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break;
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}
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}
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cout<<"NO";
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}
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