Submission #789998

#	Time	Username	Problem	Language	Result	Execution time	Memory
789998		PoonYaPat	Sorting (IOI15_sorting)	C++14	36 / 100	1 ms	468 KiB

sorting

#include "sorting.h"
#include <bits/stdc++.h>
using namespace std;
typedef pair<int,int> pii;

int n,m,a[200005],pos[200005];
vector<pii> v;

int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
	n=N; m=M;
	for (int i=0; i<n; ++i) a[i]=S[i], pos[a[i]]=i;

	if (X[0]==0 && Y[0]==0) {
		for (int i=n-1; i>=0; --i) {
			if (i!=pos[i]) {
				v.push_back(pii(i,pos[i]));

				int bef=a[i];
				a[pos[i]]=a[i];
				a[i]=i;
				pos[bef]=pos[i];
				pos[i]=i;
			}
		}
	} else {
		for (int i=n-1; i>=2; --i) {
			if (i!=pos[i]) {
				swap(a[0],a[1]);
				pos[a[0]]=0;
				pos[a[1]]=1;

				v.push_back(pii(i,pos[i]));

				int bef=a[i];
				a[pos[i]]=a[i];
				a[i]=i;
				pos[bef]=pos[i];
				pos[i]=i;
			}
		}
		if (a[0]==1 && a[1]==0) v.push_back(pii(0,0));
	}

	for (int i=0; i<v.size(); ++i) P[i]=v[i].first, Q[i]=v[i].second;
	return v.size();
}

Compilation message (stderr)

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:44:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |  for (int i=0; i<v.size(); ++i) P[i]=v[i].first, Q[i]=v[i].second;
      |                ~^~~~~~~~~
sorting.cpp:45:15: warning: conversion from 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
   45 |  return v.size();
      |         ~~~~~~^~

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