完善程序二完整程序代码
#include <iostream>
using namespace std;
struct point{
int x, y, id;
};
bool equals(point a, point b){
return a.x == b.x && a.y == b.y;
}
bool cmp(point a, point b){
return a.x != b.x ? a.x < b.x : a.y< b.y;
}
void sort(point A[], int n){
for (int i = 0; i < n; i++)
for (int j = 1; j < n; j++)
if (cmp(A[j], A[j - 1])){
point t = A[j];
A[j] = A[j - 1];
A[j - 1] = t;
}
}
int unique(point A[], int n){
int t = 0;
for (int i = 0; i < n; i++)
if ( t == 0 || !equals(A[i], A[t -1]))
A[t++] = A[i];
return t;
}
bool binary_search(point A[], int n, int x, int y){
point p;
p.x = x;
p.y = y;
p.id = n;
int a = 0, b = n - 1;
while (a < b){
int mid = (a + b) >> 1;
if (cmp(A[mid], p))
a = mid + 1;
else
b = mid;
}
return equals(A[a], p);
}
const int MAXN = 1000;
point A[MAXN];
int main(){
int n;
cin >> n;
for (int i = 0; i < n; i++){
cin >> A[i].x >> A[i].y;
A[i].id = i;
}
sort(A, n);
n = unique(A, n);
int ans = 0;
for (int i = 0; i < n; i++)
for (int j = 0; j < n; j++)
if (A[i].x<A[j].x && A[i].y < A[j].y && binary_search(A, n, A[i].x, A[j].y) &&
binary_search(A, n, A[j].x, A[i].y)){
ans++;
}
cout << ans << endl;
return 0;
}
:
标签:return,point,int,mid,初赛,id,++,2021,CSP From: https://blog.csdn.net/weixin_60445850/article/details/141705305