Submission #297973

#	Time	Username	Problem	Language	Result	Execution time	Memory
297973		Plurm	Gondola (IOI14_gondola)	C++11	15 / 100	17 ms	768 KiB

gondola

#include "gondola.h"
#include <cstring>
int valid(int n, int inputSeq[])
{
	int offs = -1;
	for(int i = 0; i < n; i++){
		if(inputSeq[i] == 1) offs = i;
	}
	for(int i = 0; i < n; i++){
		if(inputSeq[(i+offs) % n] <= n && inputSeq[(i+offs) % n] != i+1) return 0;
	}
	return 1;
}

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

int replacement(int n, int gondolaSeq[], int replacementSeq[])
{
	int offs = 0;
	int dummy = 0;
	int mx = -1;
	int* expect = new int[250005];
	memset(expect, -1, sizeof(expect));
	for(int i = 0; i < n; i++){
		if(gondolaSeq[i] <= n) offs = i-gondolaSeq[i]+1;
		else expect[gondolaSeq[i]] = i;
		if(gondolaSeq[i] > mx){
			mx = gondolaSeq[i];
			dummy = i;
		}
	}
	int rpidx = 0;
	for(int i = n+1; i <= mx; i++){
		if(expect[i] == -1){
			replacementSeq[rpidx++] = gondolaSeq[dummy];
			gondolaSeq[dummy] = i;
		}else{
			replacementSeq[rpidx++] = gondolaSeq[expect[i]];
			gondolaSeq[expect[i]] = i;
		}
	}
	return rpidx;
}

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

int countReplacement(int n, int inputSeq[])
{
	if(!valid(n, inputSeq)) return 0;
	else return 1;
}

Compilation message (stderr)

gondola.cpp: In function 'int replacement(int, int*, int*)':
gondola.cpp:23:21: warning: argument to 'sizeof' in 'void* memset(void*, int, size_t)' call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess]
   23 |  memset(expect, -1, sizeof(expect));
      |                     ^~~~~~~~~~~~~~
gondola.cpp:19:6: warning: variable 'offs' set but not used [-Wunused-but-set-variable]
   19 |  int offs = 0;
      |      ^~~~

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