c++ - 如何修复“无效的操作数到二进制表达式”？

我用C ++编写了以下程序，但出现了以下错误。遍历2D向量似乎是一个问题

我已经尝试过写作，int j = matrix.at(0).begin()但效果不佳

我遇到以下错误

 invalid operands to binary expression ('vector<int>::iterator' (aka '__wrap_iter<int *>') and 'std::__1::vector<int, std::__1::allocator<int> >::size_type' (aka 'unsigned long'))


no viable conversion from 'std::__1::vector<std::__1::vector<int, std::__1::allocator<int> >, std::__1::allocator<std::__1::vector<int, std::__1::allocator<int> > > >::iterator' (aka '__wrap_iter<std::__1::vector<int, std::__1::allocator<int> > *>') to 'int'

#include <stdio.h>
#include <vector>
#include <iterator>
using namespace std;

int diagonalSum(vector<vector<int> > matrix) {
    int sum[2] = {0};
    vector<int> s;
    for(int i = matrix.begin();i < matrix.size();i++)
    {
        for(int j = matrix[i].begin();j < matrix.[i].size();j++)
        {
            if(i == j)
                sum[0]+=matrix[i][j];
            if((i+j) == matrix.size())
                sum[1]+=matrix[i][j];
        }
    }
        return (sum[0] + sum[1]);
}
int main()
{
    vector <vector<int> > matrix = {
            {2,4,6},{4,8,12},{6,12,18}
    };
    int dSum = diagonalSum(matrix);
    return 0;
}

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