c++ 嵌套map遍历

以下是C++中嵌套map的遍历方法：

#include <iostream>
#include <map>
using namespace std;

int main() {
    map<int, map<int, string>> nestedMap;
    nestedMap[0][0] = "hello";
    nestedMap[0][1] = "world";
    nestedMap[1][0] = "foo";
    nestedMap[1][1] = "bar";

    for (auto& outerPair : nestedMap) {
        int outerKey = outerPair.first;
        map<int, string>& innerMap = outerPair.second;        for (auto& innerPair : innerMap) {
            int innerKey = innerPair.first;
            string value = innerPair.second;
            cout << "outer key: " << outerKey << ", inner key: " << innerKey << ", value: " << value << endl;
        }
    }
    return 0;
}

输出结果为：

outer key: 0, inner key: 0, value: hello
outer key: 0, inner key: 1, value: world
outer key: 1, inner key: 0, value: foo
outer key: 1, inner key: 1, value: bar