My program works like that:

int sum = 0;
int sum1 = 0;

int i = 0;

for( int j = 0; j < s; j++)
{
cin >> temp;
sum1 += temp;

if( sum1 > n + j + 1)
{
cout << "NO" << endl;
return 0;
}

if( temp < 3)
{
sum = 0;
i = j + 1;
}
else
{
sum += temp;
if( sum > n + j - i + 1)
{
cout << "NO" << endl;
return 0;
}
}
}

cout << "YES" << endl;


==========> WA in #12 V_V