题解 | #合并表记录#

#include <iostream>
#include <map>
#include <unordered_map>
using namespace std;

int main() {
    map<int, int>umap;
    int n;
    cin >> n;
    int key, value;
    while (n--) {
        cin >> key >> value;
        umap[key] += value;
    }
    for (auto& it : umap) {
        cout << it.first << " " << it.second << endl;
    }
}

数据量应该是改了，不能直接用数组做hashtable