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- #include <iostream>
- #include <vector>
- using namespace std;
- int main(){
- int n;
- cin>>n;
- vector <char> a(n);
- for (int i=0; i<n; i++){
- cin>>a[i];
- }
- int b=0;
- int c=0;
- for (int i=0; i<n-1; i++){
- if (a[i]==a[i+1]){
- if (a[i]==0){
- b++;
- }
- else{
- c++;
- }
- }
- }
- if (b==0 || c==0){
- cout<<"Yes";
- }
- else{
- cout<<"No";
- }
- }
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