제출 #467714

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
467714		jazzup	Arranging Shoes (IOI19_shoes)	C++14	컴파일 에러	0 ms	0 KiB

shoes

#include "shoes.h"
#include <deque>

int Fenwick[200010];
void add(int a,int b){
	for(int i=a;i<=200000;i+=(i&(-i))){
		Fenwick[i]+=b;
	}
}

int query(int a,int b){
	if(a!=0){
		return query(0,b)-query(0,a);
	}

	int ret=0;
	for(int i=b;i>0;i-=(i&(-i))){
		ret+=Fenwick[i];
	}
	return ret;
}

std::vector<std::pair<int,int> > p;
std::deque<int> v[200010];

long long count_swaps(std::vector<int> s) {
	int n=s.size();
	s.insert(s.begin(),0);

	for(int i=1;i<=n;i++){
		if(!v[n-s[i]].empty()){
			p.push_back(std::make_pair(v[n-s[i]].back(),i));
			v[n-s[i]].pop_back();
		}
		else{
			v[n+s[i]].push_back(i);
		}
	}


	for(int i=1;i<=n;i++){
		add(i,1);
	}

	// for(int i=0;i<p.size();i++){
	// 	printf("%d %d\n",p[i].first,p[i].second);
	// }

	long long ans=0;

	for(int i=0;i<p.size();i++){
		if(s[p[i].first]>s[p[i].second])
			ans+=query(p[i].first-1,p[i].second);
		else
			ans+=query(p[i].first,p[i].second-1);
		add(p[i].first,-1);
		add(p[i].second,-1);
		printf("%d %d\n",p[i].first,p[i].second);
	}

	return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:51:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |  for(int i=0;i<p.size();i++){
      |              ~^~~~~~~~~
shoes.cpp:58:3: error: 'printf' was not declared in this scope
   58 |   printf("%d %d\n",p[i].first,p[i].second);
      |   ^~~~~~
shoes.cpp:3:1: note: 'printf' is defined in header '<cstdio>'; did you forget to '#include <cstdio>'?
    2 | #include <deque>
  +++ |+#include <cstdio>
    3 |