MAP的運用–zzuli1663

#include<stdio.h>#include<iostream>#include<map>#include<string>using namespace std;map<string,string> a;map<string,string>::iterator it;string name,op;string num;int main(){int n,f=0;scanf("%d",&n);while(n--){a.clear();//清空if(f==1){printf("\n");}f=1;int m;scanf("%d",&m);getchar();while(m--){cin>>op>>num;if(op[0]=='I'){cin>>name;a[num]=name;//[]運算：若存在修改，如不存在插入}else if(op[0]=='D'){it=a.find(num);//尋找if(it==a.end())//若不存在{printf("NO DATA\n");continue;}a.erase(num);//刪除}else if(op[0]=='U'){cin>>name;it=a.find(num);if(it==a.end()){printf("NO DATA\n");continue;}a[num]=name;//[]運算：若存在修改，如不存在插入}else if(op[0]=='S'){it=a.find(num);if(it==a.end()){printf("NO DATA\n");continue;}name=a[num];cout<<num<<" "<<name<<endl;}}}return 0;}