제출 #287677

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
287677		TadijaSebez	Fibonacci representations (CEOI18_fib)	C++11	0 / 100	2 ms	416 KiB

fib

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
const int mod=1e9+7;
int add(int x,int y){x+=y;return x>=mod?x-mod:x;}
int mul(int x,int y){return (ll)x*y%mod;}
#define matrix vector<vector<int>>
matrix operator * (matrix a,matrix b){
	matrix ans(2,vector<int>(2,0));
	for(int i=0;i<2;++i)
		for(int j=0;j<2;++j)
			for(int k=0;k<2;++k)
				ans[i][j]=add(ans[i][j],mul(a[i][k],b[k][j]));
	return ans;
}
matrix build(int sz){
	return {{1,1},{(sz-1)/2,sz/2}};
}
const int N=100050;
int root;
matrix idx;
set<int> f;
vector<int> all;
int Find(int x){int ret=lower_bound(all.begin(),all.end(),x)-all.begin();assert(ret<all.size()&&all[ret]==x);return ret;}
vector<matrix> st;
int p2;
void Set(int i,matrix x){
	st[i+=p2]=x;
	for(i>>=1;i;i>>=1)st[i]=st[i<<1|1]*st[i<<1];
}
void Add(int a){
	f.insert(a);
	auto it=f.find(a);
	Set(Find(a),build(a-*prev(it)));
	if(next(it)!=f.end()){
		Set(Find(*next(it)),build(*next(it)-a));
	}
}
void Del(int a){
	auto it=f.find(a);
	Set(Find(a),idx);
	if(next(it)!=f.end()){
		Set(Find(*next(it)),build(*next(it)-*prev(it)));
	}
	f.erase(it);
}
map<int,int> cnt,cng;
void Inc(int a){
	assert(a!=0);
	cnt[a]++;
	if(cnt[a]==1)cng[a]++;
}
void Dec(int a){
	assert(a!=0);
	cnt[a]--;
	if(cnt[a]==0){
		cng[a]++;
		cnt.erase(a);
	}
}
void Fix(int a){
	if(cnt[a]&&cnt[a-1]){
		Dec(a);
		Dec(a-1);
		Inc(a+1);
		Fix(a+1);
		Fix(a+2);
	}else if(cnt[a]==2){
		if(a==1){
			Dec(a);Dec(a);
			Inc(a+1);
			Fix(a+1);
			Fix(a+2);
		}else{
			Inc(max(a-2,1));
			Dec(a);Dec(a);
			Inc(a+1);
			Fix(max(a-2,1));
			Fix(max(a-2,1)+1);
			Fix(a+1);
			Fix(a+2);
		}
	}
}
int Solve(){
	matrix m=st[1];
	return add(m[0][0],m[1][0]);
}
int a[N];
int main(){
	f.insert(0);
	idx={{1,0},{0,1}};
	int n;
	scanf("%i",&n);
	for(int i=1;i<=n;i++){
		scanf("%i",&a[i]);
		cng.clear();
		Inc(a[i]);
		Fix(a[i]);
		Fix(a[i]+1);
		for(auto it:cng)if(it.second&1){
			all.pb(it.first);
		}
	}
	sort(all.begin(),all.end());
	all.erase(unique(all.begin(),all.end()),all.end());
	int p2=1;while(p2<all.size())p2*=2;
	st.assign(p2*2,idx);
	cnt.clear();
	for(int i=1;i<=n;i++){
		cng.clear();
		Inc(a[i]);
		Fix(a[i]);
		Fix(a[i]+1);
		for(auto it:cng)if(it.second&1){
			if(cnt[it.first]==0)Del(it.first);
			else Add(it.first);
		}
		printf("%i\n",Solve());
	}
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

In file included from /usr/include/c++/9/cassert:44,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:33,
                 from fib.cpp:1:
fib.cpp: In function 'int Find(int)':
fib.cpp:25:84: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 | int Find(int x){int ret=lower_bound(all.begin(),all.end(),x)-all.begin();assert(ret<all.size()&&all[ret]==x);return ret;}
      |                                                                                 ~~~^~~~~~~~~~~
fib.cpp: In function 'int main()':
fib.cpp:108:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  108 |  int p2=1;while(p2<all.size())p2*=2;
      |                 ~~^~~~~~~~~~~
fib.cpp:95:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   95 |  scanf("%i",&n);
      |  ~~~~~^~~~~~~~~
fib.cpp:97:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   97 |   scanf("%i",&a[i]);
      |   ~~~~~^~~~~~~~~~~~

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