https://ac.nowcoder.com/acm/contest/76609/F
这道题我代码的思路应该是错的，但我不明白我哪里想错了，样例能过。求助

include[HTML_REMOVED]

using namespace std;
typedef long long ll;
ll n,q;
string s;
ll mo(ll l,ll r)
{
if(l==r) return 0;
ll i=l;
ll j=r;

while(i<j)
{
    if(s[i]!=s[j])
    {
        return 0;
    }

    i++;
    j--;

}
return 1;

}

int main()
{
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin>>n>>q;
cin>>s;
s=” “+s;
while(q–)
{
int x;
cin>>x;
if(x==1)
{
int p;
cin>>p;
char ch;
cin>>ch;
s[p]=ch;
continue;

    }
    else if(x==2)
    {
        ll l,r;
        cin>>l>>r;
        cout<<mo(l,r)<<endl;
        continue;

}
}
return 0;

}