func_code_string: #include <bits/stdc++.h>   using namespace std;   struct guy {     int x;     int y;     int t;   };   int r, n;   vector<guy> arr;   vector<int> dp;   int main() {     ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);     cin >> r >> n;     arr = vector<guy>(n);     dp = vector<int>(n, 0);     for (int i = 0; i < n; i++) {       cin >> arr[i].t >> arr[i].x >> arr[i].y;     }     for (int i = n - 1; i >= 0; i--) {       for (int j = i + 1; j < min(n, i + 4 * r); j++) {         if (abs(arr[j].y - arr[i].y) + abs(arr[j].x - arr[i].x) <=             arr[j].t - arr[i].t)           dp[i] = max(dp[i], 1 + dp[j]);       }     }     int ans = 0;     for (int i = 0; i < n; i++) {       if (abs(1 - arr[i].y) + abs(1 - arr[i].x) <= arr[i].t) {         ans = max(ans, 1 + dp[i]);       }     }     cout << ans <<   n ;     return 0;   }   