after reject 10100 datum structure problem Errorgorn angry Anton decide kill himantons DNA represent string contain character anton 4 distinct character Errorgorn change Antons dna string b permutation however anton body defend attack in 1 second body swap 2 adjacent character dna transform Antons body smart use minimum number movesTo maximize chance Anton die Errorgorn want change Antons dna string maximize time Antons body revert DNA but Errorgorn busy make data structure problem need help find good string b can help