C++ map 操作积累

1. map 遍历

#include 
#include 
using namespace std;

int main(){
    map m;
    for (int i = 0; i < 10; i++){
        m[i] = i*i;
    }
    map::iterator iter;
    iter = m.begin();
    while(iter != m.end()){
        cout << iter->first << "-" << iter->second << endl;
        iter++;
    }
    for (iter = m.begin();iter != m.end(); iter++){
        cout << iter->first << "-" << iter->second << endl;
    }
    for(auto &it : m){
        cout << it.first << "-" << it.second <

 

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