Submission #671463

#	Time	Username	Problem	Language	Result	Execution time	Memory
671463		smartmonky	Divide and conquer (IZhO14_divide)	C++14	17 / 100	1 ms	340 KiB

divide

#include <bits/stdc++.h>
  
#define ff first
#define ss second
#define pb push_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
using namespace std;

const int N = 100001;
struct st{
	int l, r, g, e;
};
st t[N * 4];
st a[N];
int n;
st m(st a, st b){
	st res = {};
	res.g = a.g + b.g;
	res.e = a.e + b.e;
	return res;
}
void build(int v = 1,int tl = 1, int tr = n){
    if(tl == tr){
        t[v] = a[tl];
    }else{
        int mid = (tl + tr) >> 1;
        build(v * 2, tl, mid);
        build(v * 2 + 1,mid + 1, tr);
        t[v] = m(t[v * 2], t[v * 2 + 1]);
    }
}
st get(int l, int r, int v = 1, int tl = 1, int tr = n){
    if(tl > r || tr < l)
        return {};
    if(tl >= l && tr <= r){
        return t[v];
    }
    int mid = (tl + tr) >> 1;
    return m(get(l, r, v * 2, tl, mid), get(l, r, v * 2 + 1, mid + 1, tr));
}

main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n;
    for(int i = 1; i <= n; i++){
		cin >> a[i].l >> a[i].g >> a[i].e;
		a[i].r = a[i].l;
	}
	build();
	int ans = 0;
	for(int i = 1; i <= n; i++){
		int l = i, r = n;
		while(l <= r){
			int mid = (l + r) >> 1;
			st g = get(i, mid);
			if(g.e >= abs(a[i].l - a[mid].r)){
				ans = max(ans, g.g);
				l = mid + 1;
			}else
				r = mid - 1;
		}
		st g = get(i, r);
		if(g.e >= abs(a[i].l - a[l].r))
		ans = max(ans, g.g);
		//cout << l <<" ";
	}
	//ans = max(get(n,n).g, ans);
	cout << ans;
}

Compilation message (stderr)

divide.cpp:43:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   43 | main(){
      | ^~~~

• Subtask 1: 17 / 17
• Subtask 2: 0 / 31
• Subtask 3: 0 / 52