Submission #340644

#	Time	Username	Problem	Language	Result	Execution time	Memory
340644		IZhO_2021_I_want_Silver	Divide and conquer (IZhO14_divide)	C++14	17 / 100	1 ms	364 KiB

divide

#include <iostream>
#include <algorithm>
#include <vector>
#include <cmath>
#include <set>
#include <map>
#include <iomanip>
#include <cassert>
#include <stack>
#include <queue>
#include <deque>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>-

using namespace std;
//using namespace __gnu_pbds;

typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;

// template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
//  order_of_key (k) : Number of items strictly smaller than k .
//  find_by_order(k) : K-th element in a set (counting from zero).
#define sz(a) (int)a.size()
#define all(a) a.begin(), a.end()
#define pb push_back
#define ppb pop_back
#define mkp make_pair
#define F first
#define S second
#define lb lower_bound
#define ub upper_bound
#define show(a) cerr << #a <<" -> "<< a <<" "
#define nl cerr <<"\n"
#define int ll

const int N = 2e5 + 5;
const int oo = 1e9 + 5;

int n, x[N], g[N], d[N], sumd[N], sumg[N];

int check(int len) {
    int r = 1, res = 0;
    for (int l = 1; l <= n; ++l) {
        r = max(r, l);
        while (r+1 <= n && x[r+1] <= x[l]+len) { ++r; }

        if (sumd[r] - sumd[l-1] >= len) { res = max(res, sumg[r] - sumg[l-1]); }
    }
    return res;
}

void solve() {
    cin >> n;
    for (int i = 1; i <= n; ++i) {
        cin >> x[i] >> g[i] >> d[i];
        sumg[i] = sumg[i-1] + g[i];
        sumd[i] = sumd[i-1] + d[i];
    }
    int L = 0, R = oo;
    while (L < R) {
        int mid = (L + R + 1) / 2;
        if (check(mid)) L = mid;
        else R = mid - 1;
    }
    int r = 1, res = 0;
    for (int l = 1; l <= n; ++l) {
        r = max(r, l);
        while (r+1 <= n && x[r+1] <= x[l]+sumd[r]-sumd[l-1]) { ++r; }
        if (sumd[r] - sumd[l-1] >= x[r] - x[l]) { res = max(res, sumg[r] - sumg[l-1]); }
    }
    cout << max(res, check(L));
}

 main () {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	int tests = 1;
	//cin >> tests;
	while (tests --) {
		solve();
	}
	return 0;
}
/*
    Just Chalish!
*/

Compilation message (stderr)

divide.cpp:76:8: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   76 |  main () {
      |        ^

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