Submission #287559

#	Time	Username	Problem	Language	Result	Execution time	Memory
287559		TadijaSebez	Fibonacci representations (CEOI18_fib)	C++11	5 / 100	1 ms	544 KiB

fib

#include <bits/stdc++.h>
using namespace std;
#define ll long long
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;}
const int N=150;
int cnt[N];
void Fix(){
	while(1){
		bool ok=0;
		if(cnt[1]==2)cnt[1]=0,cnt[2]++,ok=1;
		for(int i=2;i<N;i++){
			assert(cnt[i]<3);
			if(cnt[i]&&cnt[i-1]){
				cnt[i-1]--;
				cnt[i]--;
				cnt[i+1]++;
				ok=1;
			}
			if(cnt[i]==2){
				cnt[i]-=2;
				cnt[i-2]++;
				cnt[i+1]++;
				ok=1;
			}
		}
		if(!ok)break;
	}
	for(int i=1;i<N;i++)assert(cnt[i]<2&&(!cnt[i]||!cnt[i-1]));
}
int Solve(){
	int dp[2]={1,0},las=0;
	for(int i=1;i<N;i++)if(cnt[i]){
		int d0=add(dp[0],dp[1]);
		int sz=i-las-1;
		int d1=add(mul(dp[0],sz/2),mul(dp[1],(sz+1)/2));
		las=i;dp[0]=d0;dp[1]=d1;
	}
	return add(dp[0],dp[1]);
}
int main(){
	int n;
	scanf("%i",&n);
	for(int i=1;i<=n;i++){
		int a;
		scanf("%i",&a);
		cnt[a]++;
		Fix();
		printf("%i\n",Solve());
	}
	return 0;
}

Compilation message (stderr)

fib.cpp: In function 'int main()':
fib.cpp:44:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   44 |  scanf("%i",&n);
      |  ~~~~~^~~~~~~~~
fib.cpp:47:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   47 |   scanf("%i",&a);
      |   ~~~~~^~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 20
• Subtask 3: 0 / 15
• Subtask 4: 0 / 10
• Subtask 5: 0 / 15
• Subtask 6: 0 / 35