1: PriorityQueue<long[]> occ = new PriorityQueue<>((a, b) -> {
if(a[2] != b[2]) {
return Long.compare(a[2], b[2]);
} else {
if(a[0] != b[0]){
return Long.compare(a[0], b[0]);
} else {
if(a[1] != b[1]){
return Long.compare(a[1], b[1]);
}
}
}
return 0;
}); question link :https://codeforces.com/contest/2090/problem/C
2.string se save karke ek naya formula ahai ye acha hai dekh
https://leetcode.com/problems/valid-sudoku/description/
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