Language: C++

//include
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>

using namespace std;

//conversion
//------------------------------------------
inline int toInt(string s) {int v; istringstream sin(s);sin>>v;return v;}
template<class T> inline string toString(T x) {ostringstream sout;sout<<x;return sout.str();}

//math
//-------------------------------------------
template<class T> inline T sqr(T x) {return x*x;}

//typedef
//------------------------------------------
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef long long LL;

//container util
//------------------------------------------
#define ALL(a)  (a).begin(),(a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define MP make_pair
#define SZ(a) int((a).size())
#define EACH(i,c) for(typeof((c).begin()) i=(c).begin(); i!=(c).end(); ++i)
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define SORT(c) sort((c).begin(),(c).end())

//repetition
//------------------------------------------
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)

//constant
//--------------------------------------------
const double EPS = 1e-10;
const double PI  = acos(-1.0);

//clear memory
#define CLR(a) memset((a), 0 ,sizeof(a))

//debug
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << endl;

int main(){
    int N; cin >> N;
    VI H(N);
    REP(i,N){
        cin >> H[i];
    }
    bool yn = true;
    for(int i=N-1; i>0; i--){
        if(H[i-1] > H[i]){
            H[i-1]--;
            if(H[i-1] > H[i]){
                yn = false;
                break;
            }
        }
    }
    // bool yn = true;
    // FOR(i,0,N-2){ //iマス目の右に。。。
    //     FOR(j,1,N-i){ //iマス目のj個右
    //         if( (H[i]-2) >= H[i+j]){
    //             yn = false;
    //             break;
    //         }
    //     }
    //     if(!yn) break;
    // }
    // for(int i=0,j=1; (i+j)<=N; i++){
    //     while((H[i]-2) < H[i+j]){
    //         j++;
    //     }
    //     if(j!=(N-i)){
    //         yn = false;
    //         break;
    //     }
    // }
    if(yn)　cout << "Yes" <<endl;
    else　cout << "No" << endl;
    
    return 0;
}

Compiler output:
a.cc:107:11: error: extended character 　 is not valid in an identifier
  107 |     if(yn)　cout << "Yes" <<endl;
      |           ^
a.cc:108:5: error: extended character 　 is not valid in an identifier
  108 |     else　cout << "No" << endl;
      |     ^
a.cc: In function 'int main()':
a.cc:107:11: error: '\U00003000cout' was not declared in this scope
  107 |     if(yn)　cout << "Yes" <<endl;
      |           ^~~~~~
a.cc:108:5: error: 'else\U00003000cout' was not declared in this scope
  108 |     else　cout << "No" << endl;
      |     ^~~~~~~~~~