Submission #108483

#	Time	Username	Problem	Language	Result	Execution time	Memory
108483		E869120	Bulldozer (JOI17_bulldozer)	C++14	25 / 100	26 ms	584 KiB

bulldozer

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

struct Fraction {
public:
	long long cx, cy;
};

long long gcd(long long a, long long b) {
	if (b == 0) return a;
	return gcd(b, a%b);
}

Fraction teisei(Fraction A) {
	long long E = gcd(A.cx, A.cy);
	A.cx /= E; A.cy /= E;
	return A;
}

long long N, X[109], Y[109], W[109], ans; bool ok = false;
vector<Fraction>E;

int main() {
	cin >> N;
	for (int i = 0; i < N; i++) { cin >> X[i] >> Y[i] >> W[i]; if (Y[i] != 0) ok = true; }
	E.push_back(Fraction{ 0, 1 });
	if (ok == true) {
		for (int i = 0; i < N; i++) {
			for (int j = i + 1; j < N; j++) E.push_back(teisei(Fraction{ X[j] - X[i],Y[j] - Y[i] }));
		}
	}
	for (Fraction R : E) {
		vector<pair<long long, int>>vec;
		for (int i = 0; i < N; i++) vec.push_back(make_pair(X[i] * -R.cy + Y[i] * R.cx, i));
		sort(vec.begin(), vec.end());

		long long sum = 0, minx = 0;
		for (int i = 0; i < vec.size(); i++) {
			sum += W[vec[i].second]; minx = min(minx, sum);
			ans = max(ans, sum - minx);
		}
	}
	cout << ans << endl;
	return 0;
}

Compilation message (stderr)

bulldozer.cpp: In function 'int main()':
bulldozer.cpp:40:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i = 0; i < vec.size(); i++) {
                   ~~^~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 20 / 20
• Subtask 3: 0 / 35
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20