C++ 堆栈溢出是什么原因造成的？

Question

I am new to C++ and wrote the following:

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

when the input is 1 I am getting overflow error, why is that? the last line seems the problem but I think it's totally fine.

Answer 1

The expression ""+i doesn't convert the integer value in i to a string. Instead it's the same as &(("")[i]) . Ie it's a pointer to the i:th value of the string "" . Which is out of bounds since the empty string only have a single element at index 0 (the string terminator).

Usestd::to_string instead:

result[i-1]=std::to_string(i);