Educational Codeforces Round 127 (Rated for Div. 2)代码打卡

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A. String Building

#include<iostream>
#include<cstring>
#include<algorithm>
#include<cstring>
using namespace std;

const int N =1e5+10;
int t;
string a;
 
int main()
{
   cin >> t;
   while(t--)
   {
       cin >> a;
       bool st=false;
        for(int i=0;i<a.size();)
        {
            int j=i+1;
            while(a[i]==a[j]) j++;
            // cout << i <<" "<<j<< " "<<(j-i)<<endl;
            if((j-i)==1 && !st) 
            {
                cout << "NO"<<endl;
                st=true;
            }
            i=j;
            
        }
        if(!st) cout << "YES"<<endl;
      
   }
    
    return 0;
}

B. Consecutive Points Segment

#include <iostream>
#include <algorithm>
#include <vector>
 
using namespace std;
const int N=2e5+10;
int a[N];
 
int main() {
	 int t;
    cin >> t;
    while (t--){
        int n;
        cin >> n;
        for (int i = 1; i <= n; ++i)
            cin >> a[i];
        int sum = a[n] - a[1];
        if (sum - n + 1 > 2)
            cout << "NO\n";
        else
            cout << "YES\n";
    }
	return 0;
}