Submission #671618

#	Time	Username	Problem	Language	Result	Execution time	Memory
671618		smartmonky	Divide and conquer (IZhO14_divide)	C++14	100 / 100	29 ms	3484 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()
#define int long long
using namespace std;
 
const int N = 500001;
int f[N],s[N], pos[N], m[N];
int n;
main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin >> n;
	for(int i = 1; i <= n; i++){
		int a, b, c;
		cin >> a >>b >> c;
		pos[i] = a;
		f[i] = b + f[i - 1];
		s[i] = c + s[i - 1];
		m[i] = s[i] - a;
	}
	for (int i = n - 1; i >= 1; i--){
		m[i] = max(m[i] ,m[i+1]);
	}
	int ans = 0;
	for(int i = 1; i <= n; i++){
		int l = i, r = n, res;
		while(l <= r){
			int mid = (l + r) >> 1;
			if(s[i - 1] - pos[i] <= m[mid]){
				res = mid;
				l = mid + 1;
			}else
				r = mid - 1;
		}
		ans = max(ans ,f[res] - f[i-1]);
	}
	cout << ans;
}

Compilation message (stderr)

divide.cpp:14:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   14 | main(){
      | ^~~~
divide.cpp: In function 'int main()':
divide.cpp:41:23: warning: 'res' may be used uninitialized in this function [-Wmaybe-uninitialized]
   41 |   ans = max(ans ,f[res] - f[i-1]);
      |                  ~~~~~^

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