32 lines
718 B
C++
32 lines
718 B
C++
#include <iostream>
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#include <map>
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using namespace std;
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bool cmp(int a, int b){
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return a < b;
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}
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int main(){
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auto cmpl = [](int a, int b){
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return a > b;
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};
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multimap<int, string, bool(*)(int, int)> a(cmp);
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multimap<int, string, decltype(cmpl)> b(cmpl);
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a.insert({{1,"111"},{2,"222"},{1,"11"},{1,"1"},{2,"22"},{3,"333"}});//emplace只能用make_pair，不能直接这么写
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//pair<const int, string>，Key是const修饰的
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for(pair<int, string> x : a){
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cout << x.first << ", " << x.second << " ";
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}
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cout << endl;
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cout << a.find(1)->second << " " << a.count(1) << endl;
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a.erase(a.find(1));
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cout << a.find(1)->second << " " << a.count(1) << endl;
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return 0;
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}
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/*
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1, 111 1, 11 1, 1 2, 222 2, 22 3, 333
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111 3
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11 2
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*/
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