412. Fizz Buzz(C++)

Write a program that outputs the string representation of numbers from 1 to n.

But for multiples of three it should output “Fizz” instead of the number and for the multiples of five output “Buzz”. For numbers which are multiples of both three and five output “FizzBuzz”.

Example:

n = 15,Return:[    "1",    "2",    "Fizz",    "4",    "Buzz",    "Fizz",    "7",    "8",    "Fizz",    "Buzz",    "11",    "Fizz",    "13",    "14",    "FizzBuzz"]

找错误：

class Solution {public:    vector<string> fizzBuzz(int n) {        vector<string> res(n);        for(int i = 1; i <= n; ++i) { // 索引是从i = 0开始的，一共n个            if (i % 15 == 0) res[i] = "FizzBuzz";            else if (i % 5 == 0) res[i] = "Buzz";            else if (i % 3 == 0) res[i] = "Fizz";            else res[i] = to_string(i);        }        return res;    }};

纠错后完整代码：

#include<iostream>#include<vector>using namespace std;class Solution {    public:        vector<string> fizzBuzz(int n) {            vector<string> res(n);            for(int i = 1; i <= n; ++i) {                if (i % 15 == 0) res[i - 1] = "FizzBuzz";                else if (i % 5 == 0) res[i - 1] = "Buzz";                else if (i % 3 == 0) res[i - 1] = "Fizz";                else res[i - 1] = to_string(i);            }            return res;        }};int main() {    int n;    cin >> n;    Solution sol;    vector<string> strVec = sol.fizzBuzz(n);    for (int i = 0; i < n; i++){        cout << strVec[i] <<endl;    }    return 0;}

正确代码1：

class Solution {public:    vector<string> fizzBuzz(int n) {        vector<string> res(n);        for (int i = 1; i <= n; ++i) {            if (i % 3 == 0) res[i - 1] += "Fizz";            if (i % 5 == 0) res[i - 1] += "Buzz";            if (res[i - 1] == "") res[i - 1] += to_string(i);        }        return res;    }};

正确代码2：

class Solution {public:    vector<string> fizzBuzz(int n) {        vector<string> res;  // 注意不是vector<string> res(n);        // 使用push_back则vector不定长        for (int i = 1; i <= n; i++) {            if (i % 15 == 0) res.push_back("FizzBuzz");            else if (i % 3 ==0) res.push_back("Fizz");            else if (i % 5 == 0) res.push_back("Buzz");            else res.push_back(to_string(i));        }        return res;    }};