Given an array nums of distinct integers, return all the possible permutations. You can return the answer in any order.

string op2 = output + string(1, (islower(input[0])?(char)toupper(input[0]):(char)tolower(input[0]))); generateP_1(op1, input.substr(1), result); generateP_1(op2 ...

Tap here to see the full World Cup knockout bracket and every team's path to the final. With the World Cup group stage coming to a thrilling end Saturday, here's a rundown of who reached the knockouts ...

Abstract: Equivariant quantum graph neural networks (EQGNNs) offer a potentially powerful method to process graph data. However, existing EQGNN models only consider the permutation symmetry of graphs, ...

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