Submission #167638

#	Time	Username	Problem	Language	Result	Execution time	Memory
167638		Eae02	Gondola (IOI14_gondola)	C++17	55 / 100	31 ms	4232 KiB

gondola

#include "gondola.h"
#include <bits/stdc++.h>
#define all(x) begin(x), end(x)
using namespace std;

int valid(int n, int inputSeq[]) {
	for (int i = 0; i < n; i++)
		inputSeq[i]--;
	
	unordered_set<int> seen;
	
	int startIdx = -1;
	for (int i = 0; i < n; i++) {
		if (inputSeq[i] < n && startIdx == -1) {
			startIdx = i;
		}
		if (seen.count(inputSeq[i]))
			return 0;
		seen.insert(inputSeq[i]);
	}
	if (startIdx == -1) {
		return 1;
	}
	
	seen.clear();
	
	int g = inputSeq[startIdx];
	for (int i = 0; i < n; i++) {
		int idx = (i + startIdx) % n;
		if (inputSeq[idx] < n && inputSeq[idx] != g) {
			return 0;
		}
		g = (g + 1) % n;
	}
	
	return 1;
}

int replacement(int n, int inputSeq[], int replacementSeq[])
{
	for (int i = 0; i < n; i++)
		inputSeq[i]--;
	
	int startIdx = -1;
	for (int i = 0; i < n; i++) {
		if (inputSeq[i] < n) {
			startIdx = i;
			break;
		}
	}
	
	vector<pair<int, int>> br;
	
	int g;
	if (startIdx == -1) {
		g = 0;
		startIdx = 0;
	} else {
		g = inputSeq[startIdx];
	}
	
	for (int i = 0; i < n; i++) {
		int idx = (i + startIdx) % n;
		if (inputSeq[idx] >= n) {
			//cerr << inputSeq[idx] << ", should be " << g << "\n";
			br.emplace_back(inputSeq[idx] - n, g);
		}
		g = (g + 1) % n;
	}
	
	sort(all(br));
	
	int l = 0;
	for (auto b : br) {
		replacementSeq[l++] = b.second + 1;
		while (l <= b.first) {
			replacementSeq[l] = n + l;
			l++;
		}
	}
	
	return l;
}

//----------------------

int countReplacement(int n, int inputSeq[])
{
	return valid(n, inputSeq) ? 0 : 1;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 10 / 10
• Subtask 6: 20 / 20
• Subtask 7: 0 / 5
• Subtask 8: 0 / 15
• Subtask 9: 0 / 15
• Subtask 10: 0 / 10