classSolution{public:vector<int>intersect(vector<int>& nums1, vector<int>& nums2){ unordered_map<int,int> m; vector<int> ret;for(autoe:nums1) { m[e]++; }for(autoe:nums2) {if(m.count(e)) { ret.push_back(e); m[e]--;if(m[e]==0) { m.erase(e); } } }returnret; ...
#include <unordered_map> int main() { // 使用列表初始化 std::unordered_map<char, int> m1 = {{'a', 1}, {'b', 2}, {'c', 3}}; // 另一种等价的写法 std::unordered_map<char, int> m2{{'a', 1}, {'b', 2}, {'c', 3}}; return 0; } 2、使用 insert 方法 #include...
#include<tr1/unordered_set>#include<tr1/unordered_map>#include<iostream>usingnamespacestd;usingnamespacetr1; unordered_set<int> S1; unordered_multiset<int> S2; unordered_map<int,int> M;intmain(){ S1.insert(6); S2.insert(7); M[233333] =666666; cout << M[233333]; } 然后就可以在非11...
map<int,int>q;//方法一for(auto&it:q){cout<<it.first<<" "<<it.second<<endl; }//方法二for(map<int,int>::iterator it=q.begin();it!=q.end();it++){cout<< it->first <<" "<< it->second <<endl; } 重点介绍 不知道你有没有遇到这样的场景 这个题好水呀,看我直接秒切! 我可...
map<int, int> m; for (int i = 0; i < n; i++) m[arr[i]]++; cout << "Element Frequency" << endl; for (auto i : m) cout << i.first << " " << i.second << endl; return 0; } unordered_map // CPP program to traverse a unordered_map using // range based for loo...
for (int n = 1; n <= 1e6; n *= 10) for (int m = 1; m <= 1e6; m *= 10) { map<int, int> M; srand(233); start = clock(); for (int i = 1; i <= n; i++) M[rand()] = rand(); cout << "|Writing spends |" << clock() - start << '|' << n << ...
undered_map<int,int>m;#定义了一个叫做m的hash表;key为int value 为int型m.find(value)!=m.end()#这句话的意思是在m中手否找到value的值,没找到话返回的是m.end()#- 找到:返回元素的迭代器。通过迭代器的second属性获取值m[nums[i]]=i# 这个是添加操作,使第i项为 nums[i]...
unordered_map<int, string> map3 = map2; unordered_map<int, string>::iterator iter3 = map3.begin(); cout << "map3.size = " << map3.size() << " map3.empty = " << map3.empty() << " map3.max_size = " << map3.max_size() << endl; ...
unordered_map < string, int > mp; signed main() { int n; cin >> n; for (int i = 1; i <= n; ++i) { int op, score; string name; cin >> op; if (op == 1) { cin >> name >> score; mp[name] = score; cout << "OK\n"; } else if (op == 2) { cin >> name...
map<int, int> m; unordered_map<int, int> um; hash_map<int, int> hm; // 初始化 for (int i = 0; i<size; i++) { m[i] = i; um[i] = i; hm[i] = i; } // map的查找 { int count = 0; progress_timer t; // progress_timer变量会在创建时计时,析构时自动打印出耗时,所...