Submission #1133280

#	Time	Username	Problem	Language	Result	Execution time	Memory
1133280		alterio	Comparing Plants (IOI20_plants)	C++20	0 / 100	0 ms	328 KiB

plants

#include <bits/stdc++.h>
#include "plants.h"

using namespace std;

const int mxn = 2e5 + 100;

int n, k;
int prf[mxn];

int get(int l, int r) {
	return prf[r] - (l ? prf[l - 1] : 0);
}

void init(int _k, std::vector<int> r) {
	k = _k;
	n = r.size();
	for (int i = 0; i < n; i++) prf[i] = (i ? prf[i - 1] : 0) + (r[i] == 1 ? -1 : 1);
	return;
}

// 1 > : -1 < : 0 ?
int compare_plants(int x, int y) {
	int mult = 1;
	if (x > y) swap(x, y), mult = -1;
	int ans1 = 0, ans2 = 0;
	int sum = get(x, y - 1); 
	if (abs(sum) == y - x) ans1 = sum / abs(sum);
	sum = get(x, n - 1);
	if (y) sum += get(0, y - 1);
	if (abs(sum) == (n - x + y)) ans2 = sum / abs(sum);
	int ans = ans1;
	if (ans1 == 0) ans = ans2;
	else if (ans2 == 0) ans = ans1;
	else if (ans1 != ans2) ans = 0;
	return ans * mult;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 14
• Subtask 3: 0 / 13
• Subtask 4: 0 / 17
• Subtask 5: 0 / 11
• Subtask 6: 0 / 15
• Subtask 7: 0 / 25