题解 | 合并表记录
合并表记录
https://www.nowcoder.com/practice/de044e89123f4a7482bd2b214a685201
#include <iostream>
#include <map>
#include <unordered_map>
using namespace std;
int main() {
map<int, int> mp;
int n;
cin>>n;
while(n--)
{
int x, y;
cin>>x>>y;
mp[x]+=y;
}
for(auto it:mp)
cout<<it.first<<" "<<it.second<<"\n";
}
哈希思路没得说，注意到样例也是按键值升序输出的，所以用map不用unordered_map