Submission #308301

#	Time	Username	Problem	Language	Result	Execution time	Memory
308301		kimjg1119	Mountains (IOI17_mountains)	C++17	20 / 100	1 ms	384 KiB

mountains

#include "mountains.h"
#include <vector>
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

struct pt {
	ll x, y;
};

int ccw(pt a, pt b, pt c) {
	ll t = (b.x - a.x) * (c.y - a.y) - (c.x - a.x) * (b.y - a.y);
	return t ? (t > 0 ? 1 : -1) : 0;
}

int dp[2020] = {};
int maximum_deevs(std::vector<int> y) {
	int n = y.size();
	for (int i = 0; i < n; i++) {
		dp[i] = 1;
		for (int j = 0; j < i; j++) {
			bool flag = false;
			for (int k = j + 1; k < i; k++)
				if (ccw({ j,y[j] }, { i,y[i] }, { k,y[k] }) > 0) flag = true;
			if (flag) dp[i] = max(dp[i], dp[j] + 1);
		}
	}
	int ans = 0;
	for (int i = 0; i < n; i++) ans = max(ans, dp[i]);
	return ans;
}

• Subtask 1: 20 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 30
• Subtask 4: 0 / 30