https://www.codechef.com/viewsolution/36564156
can’t understand why TLE.
since second dimention has 26 elements only…Can’t seem logical to optimize it.
ll sum(vector<vector<ll>> bit, ll r, ll idy) {
Try passing bit by reference.
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It works but problem is why it is giving wrong
https://www.codechef.com/viewsolution/36564688
I spend my whole day figuring and develping solution , please help brother
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I just tried Make BIT for every alphabet and store in a array , and then transverse simply to figure it out which one is required for query