Submission #77211

#	Time	Username	Problem	Language	Result	Execution time	Memory
77211		Dat160601	Palindrome-Free Numbers (BOI13_numbers)	C++17	73.75 / 100	23 ms	704 KiB

numbers

#include <bits/stdc++.h>
using namespace std;
long long a,b;
long long len_a=0,len_b=0;
long long digit_a[20],digit_b[20];
long long dp[20][2][2][11][11];
long long go(int id,int l,int r,int prv,int pv){
	if(id==0) return 1LL;
	if(dp[id][l][r][prv][pv]!=-1) return dp[id][l][r][prv][pv];
	long long ret=0;
	for(int i=0;i<=9;i++){
		if(l==1 && i<digit_a[id]) continue;
		if(r==1 && i>digit_b[id]) continue;
		if(i==prv || i==pv) continue;
		ret+=go(id-1,(l==1 && i==digit_a[id])?1:0,(r==1 && i==digit_b[id])?1:0,pv,i);
	}
	dp[id][l][r][prv][pv]=ret;
	return ret;
}
int main(){
	scanf("%lld %lld",&a,&b);
	long long x=a;
	while(x>0){
		digit_a[++len_a]=x%10;
		x/=10;
	}
	x=b;
	while(x>0){
		digit_b[++len_b]=x%10;
		x/=10;
	}
	memset(dp,-1,sizeof(dp));
	long long ans=0;
	for(int i=len_b;i>=len_a;i--) ans+=go(i,1,1,10,10);
	printf("%lld",ans);
}

Compilation message (stderr)

numbers.cpp: In function 'int main()':
numbers.cpp:21:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld %lld",&a,&b);
  ~~~~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 13.75 / 25
• Subtask 2: 60 / 75