每日一题 - 240106 - C - Loong Tracking

• C - Loong Tracking

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• TAG - $前缀和、坐标轴、重载运算符$
• 时间复杂度 - $O(M)$

//
#include<bits/stdc++.h>
using namespace std;
// #define int long long 

const int N=1e6+7;
struct A{
   
    
    int x,y; 
    void operator += (A in) {
   
   
        x += in.x;
        y += in.y;
    }
}sum[N];
int