60. Permutation Sequence
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别人的代码,要2刷,用之前的方法都会超时
class Solution {public: string getPermutation(int n, int k) { int pTable[10] = {1}; for(int i = 1; i <= 9; i++){ pTable[i] = i * pTable[i - 1]; } string result; vector<char> numSet; numSet.push_back('1'); numSet.push_back('2'); numSet.push_back('3'); numSet.push_back('4'); numSet.push_back('5'); numSet.push_back('6'); numSet.push_back('7'); numSet.push_back('8'); numSet.push_back('9'); while(n > 0){ int temp = (k - 1) / pTable[n - 1]; result += numSet[temp]; numSet.erase(numSet.begin() + temp); k = k - temp * pTable[n - 1]; n--; } return result;}};
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