Submission #60075

#	Time	Username	Problem	Language	Result	Execution time	Memory
60075		Eae02	Sorting (IOI15_sorting)	C++14	16 / 100	1057 ms	436 KiB

sorting

#include "sorting.h"

#include <bits/stdc++.h>
#define all(x) x.begin(),x.end()

int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[])
{
	std::vector<int> sorted(S, S + N);
	std::sort(all(sorted));
	
	std::vector<int> sInitial(S, S + N);
	
	for (int t = 0; t < M; t++)
	{
		std::vector<int> finalAccess(N, 0);
		for (int i = 0; i < t; i++)
		{
			finalAccess[X[i]] = i;
			finalAccess[Y[i]] = i;
		}
		
		std::copy(all(sInitial), S);
		
		int R = 0;
		for (; R < t; R++)
		{
			if (std::equal(S, S + N, sorted.begin()))
				return R;
			
			std::swap(S[X[R]], S[Y[R]]);
			
			int index = -1;
			for (int i = 0; i < N; i++)
			{
				if (R >= finalAccess[i] && S[i] != sorted[i])
				{
					index = i;
					break;
				}
			}
			
			if (index == -1)
			{
				for (int i = 0; i < N; i++)
				{
					if (R + 1 == finalAccess[i] && S[i] != sorted[i])
					{
						index = i;
						break;
					}
				}
				
				if (index == -1 || R + 1 == t)
				{
					P[R] = Q[R] = 0;
				}
				else
				{
					int val = sorted[index];
					int target = X[R + 1] == index ? Y[R + 1] : X[R + 1];
					
					auto valIt = std::find(S, S + N, val);
					std::swap(S[target], *valIt);
					
					P[R] = target;
					Q[R] = valIt - S;
				}
			}
			else
			{
				int val = sorted[index];
				auto valIt = std::find(S, S + N, val);
				std::swap(S[index], *valIt);
				
				P[R] = index;
				Q[R] = valIt - S;
			}
		}
	}
}

Compilation message (stderr)

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:66:19: warning: conversion to 'int' from 'long int' may alter its value [-Wconversion]
      Q[R] = valIt - S;
             ~~~~~~^~~
sorting.cpp:76:18: warning: conversion to 'int' from 'long int' may alter its value [-Wconversion]
     Q[R] = valIt - S;
            ~~~~~~^~~
sorting.cpp:80:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

• Subtask 1: 0 / 8
• Subtask 2: 0 / 12
• Subtask 3: 16 / 16
• Subtask 4: 0 / 18
• Subtask 5: 0 / 20
• Subtask 6: 0 / 26