Submission #345677

# Submission time Handle Problem Language Result Execution time Memory
345677 2021-01-07T20:30:37 Z ogibogi2004 Sorting (IOI15_sorting) C++14
Compilation error
0 ms 0 KB
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "sorting.h"

static char _buffer[1024];
static int _currentChar = 0;
static int _charsNumber = 0;
static FILE *_inputFile, *_outputFile;

static inline int _read() {
    if (_charsNumber < 0) {
        exit(1);
    }
    if (!_charsNumber || _currentChar == _charsNumber) {
        _charsNumber = (int)fread(_buffer, sizeof(_buffer[0]), sizeof(_buffer), _inputFile);
        _currentChar = 0;
    }
    if (_charsNumber <= 0) {
        return -1;
    }
    return _buffer[_currentChar++];
}

static inline int _readInt() {
    int c, x, s;
    c = _read();
    while (c <= 32) c = _read();
    x = 0;
    s = 1;
    if (c == '-') {
        s = -1;
        c = _read();
    }
    while (c > 32) {
        x *= 10;
        x += c - '0';
        c = _read();
    }
    if (s < 0) x = -x;
    return x;
}





#include "sorting.h"
#include <bits/stdc++.h>
using namespace std;
const int MAXN=2e5+6;
vector<pair<int,int> >swaps;
int seq[MAXN],seq1[MAXN],seq2[MAXN];
bool vis[MAXN];
int n;
vector<pair<int,int> >moves;
bool check(int x)
{
	for(int i=0;i<n;i++)
	{
		seq1[i]=i;
	}
	for(int j=0;j<x&&j<swaps.size();j++)
	{
		swap(seq1[swaps[j].first],seq1[swaps[j].second]);
	}
	for(int i=0;i<n;i++)
	{
		seq2[i]=seq[seq1[i]];
	}
	int cnt=0;
	memset(vis,0,sizeof(vis));
	moves.clear();
	/*cout<<x<<":";
	for(int i=0;i<n;i++)
	{
		cout<<seq1[i]<<" ";
	}
	cout<<endl;*/
	for(int i=0;i<n;i++)
	{
		if(vis[i]==0)
		{
			int u=i;
			while(vis[u]==0)
			{
				vis[u]=1;
				moves.push_back({i,seq2[u]});
				u=seq2[u];
			}
			cnt++;
			moves.pop_back();
		}
	}
	//cout<<x<<" "<<cnt<<endl;
	if(moves.size()<=x)
	{
		while(moves.size()<x)moves.push_back({0,0});
		return 1;
	}
	else return 0;
}
int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
    n=N;
    for(int i=0;i<n;i++)seq[i]=S[i];
    for(int i=0;i<M;i++)swaps.push_back({X[i],Y[i]});
    int low=0,high=M,mid,ans;
    while(low<=high)
    {
		mid=(low+high)/2;
		if(check(mid))
		{
			ans=mid;
			high=mid-1;
		}
		else low=mid+1;
	}
	//cout<<ans<<endl;
	check(ans);
	for(int i=0;i<moves.size();i++)
	{
		P[i]=moves[i].first;Q[i]=moves[i].second;
	}
	return moves.size();
}










int main()
{
	_inputFile = fopen("sorting.in", "rb");
	_outputFile = fopen("sorting.out", "w");
	int N, M;
	N = _readInt();
	int *S = (int*)malloc(sizeof(int) * (unsigned int)N);
	for (int i = 0; i < N; ++i)
		S[i] = _readInt();
	M = _readInt();
	int *X = (int*)malloc(sizeof(int) * (unsigned int)M), *Y = (int*)malloc(sizeof(int) * (unsigned int)M);
	for (int i = 0; i < M; ++i) {
	    X[i] = _readInt();
	    Y[i] = _readInt();
	}
	int *P = (int*)malloc(sizeof(int) * (unsigned int)M), *Q = (int*)malloc(sizeof(int) * (unsigned int)M);
	int ans = findSwapPairs(N, S, M, X, Y, P, Q);
	fprintf(_outputFile, "%d\n", ans);
	for (int i = 0; i < ans; ++i)
		fprintf(_outputFile, "%d %d\n", P[i], Q[i]);
	return 0;
}

Compilation message

sorting.cpp: In function 'bool check(int)':
sorting.cpp:63:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |  for(int j=0;j<x&&j<swaps.size();j++)
      |                   ~^~~~~~~~~~~~~
sorting.cpp:96:17: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   96 |  if(moves.size()<=x)
      |     ~~~~~~~~~~~~^~~
sorting.cpp:98:21: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   98 |   while(moves.size()<x)moves.push_back({0,0});
      |         ~~~~~~~~~~~~^~
sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:120:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  120 |  for(int i=0;i<moves.size();i++)
      |              ~^~~~~~~~~~~~~
sorting.cpp:124:19: warning: conversion from 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
  124 |  return moves.size();
      |         ~~~~~~~~~~^~
sorting.cpp:119:7: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
  119 |  check(ans);
      |  ~~~~~^~~~~
/tmp/cc4ySHY3.o: In function `main':
grader.c:(.text.startup+0x0): multiple definition of `main'
/tmp/ccUuvMZK.o:sorting.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status