Submission #89475

#	Time	Username	Problem	Language	Result	Execution time	Memory
89475		inom	Divide and conquer (IZhO14_divide)	C++14	0 / 100	3 ms	568 KiB

divide

#include<bits/stdc++.h>
#include<ext/pb_ds/tree_policy.hpp>
#include<ext/pb_ds/assoc_container.hpp>

#define fi first
#define se second
#define new new228
#define pb push_back
#define rank rank228
#define int long long
#define sz(c) (int)(c).size()
#define all(c) (c).begin(), (c).end()
#define rall(c) (c).rbegin(), (c).rend()
#define in freopen("divide.in", "r", stdin);
#define out freopen("divide.out", "w", stdout);

using namespace std;
using namespace __gnu_pbds;

#pragma GCC optimize("Ofast")
#pragma GCC optimize("no-stack-protector")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,popcnt,abm,mmx,tune=native")
#pragma GCC optimize("fast-math")
#pragma warning(disable : 4996)

typedef tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set; // st.oreder_of_key();

const int N = 300300;
const int INF = 1e15;
const int MOD = 1e9 + 7;

int TN = 1;

int n, ans;
int x[N], g[N], d[N];

bool can(int r, int l) {
	return x[r] - x[l] <= d[r] - d[l - 1];
}

void solve() {
	scanf("%lld", &n);
	for (int i = 1; i <= n; i++) {
		scanf("%lld %lld %lld", &x[i], &g[i], &d[i]);
		ans = max(ans, g[i]);
		g[i] += g[i - 1]; d[i] += d[i - 1];		
	}
	for (int i = 1; i <= n; i++) {
		int l = i, r = n;
		while (l <= r) {
			int mid = (l + r) >> 1;
			if (can(mid, i)) {
				l = mid + 1;
			} else {
				r = mid - 1;
			}
		}
		ans = max(ans, g[l] - g[i - 1]);
		/*if (can(r, i)) {
			ans = max(ans, g[r] - g[i - 1]);
		}
		if (can(l, i)) {
			ans = max(ans, g[l] - g[i - 1]);
		}*/
	}
	printf("%lld\n", ans);
	return;
}

signed main() {
    // ios_base::sync_with_stdio(0);
    // in; out; // cin >> TN;
    while (TN--) { solve(); }
    return 0;
 }

Compilation message (stderr)

divide.cpp:25:0: warning: ignoring #pragma warning  [-Wunknown-pragmas]
 #pragma warning(disable : 4996)
 
divide.cpp: In function 'void solve()':
divide.cpp:43:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld", &n);
  ~~~~~^~~~~~~~~~~~
divide.cpp:45:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld %lld %lld", &x[i], &g[i], &d[i]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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