CCF2018.9.2买菜

 1 #include<iostream>
 2 using namespace std;
 3 int main()
 4 {
 5     int a[2000], b[2000], c[2000], d[2000];
 6     int n, t = 0, count = 0;
 7     cin >> n;
 8     for (int i = 0; i < n; i++)
 9         cin >> a[i] >> b[i];
10     for (int i = 0; i < n; i++)
11         cin >> c[i] >> d[i];
12     int i = 0, j = 0;
13     while (i < n && j <n) {
14         count++;
15         if (count > a[i] && count <= b[i]) {
16             if (count > c[j] && count <= d[j]) {
17                 t++;
18             }
19 
20         }
21         if (count == b[i])i++;
22         if (count == d[j])j++;
23     }
24     cout << t;
25     return 0;
26 }