描述
题解
这个题根据题意,我们知道,根据 x 和
代码
#include <cstdio>
#include <iostream>
#include <algorithm>
using namespace std;
const int MAXN = 2e5 + 10;
const int INF = 0x3f3f3f3f;
struct node
{
int l, r;
};
int n;
node a[MAXN];
bool cmp(node a, node b)
{
if (a.r == b.r)
{
return a.l < b.l;
}
return a.r < b.r;
}
int main()
{
cin >> n;
int x, w;
for (int i = 0; i < n; i++)
{
scanf("%d%d", &x, &w);
a[i].l = x - w;
a[i].r = x + w;
}
sort(a, a + n, cmp);
int L = -INF;
int ans = 0;
for (int i = 0; i < n; i++)
{
if (a[i].l >= L)
{
L = a[i].r;
ans++;
}
}
cout << ans << endl;
return 0;
}