Submission #855190

#	Time	Username	Problem	Language	Result	Execution time	Memory
855190		ThylOne	Palindrome-Free Numbers (BOI13_numbers)	C++14	39.17 / 100	2 ms	600 KiB

numbers

#include<bits/stdc++.h>

using namespace std;
typedef long long ll;
string limit;
int dpTab[2][20][12][12];
int dp(bool L,int pos=0,int last1=10,int last2=10){
	if(pos==limit.size())return 1;
	if(dpTab[L][pos][last1][last2]!=-1)
		return dpTab[L][pos][last1][last2];
	
	int cnt=0;
	int borne = (limit[pos]-'0');
	if(!L)borne=9;
	for(int digit=0;digit<=borne;digit++){
		if(digit!=last1 && digit!=last2){
			int L2 = (borne==digit);
			if(L==false)L2=false;
			cnt+=dp(L2,pos+1,digit,last1);
		}
	}
	dpTab[L][pos][last1][last2] = cnt;
	return dpTab[L][pos][last1][last2];
	
}

void setDp(ll lim){
	limit = to_string(lim);
	for(int b=0;b<2;b++){
		for(int pos=0;pos<20;pos++){
			for(int last1=0;last1<=10;last1++){
				for(int last2=0;last2<=10;last2++){
					dpTab[b][pos][last1][last2]=-1;
				}
			}
		}
	}
}
signed main(){
	ll a,b;
	cin>>a>>b;
	int cnt=0;
	setDp(b);
	cnt+=dp(true,0,10,10);
	setDp(a-1);
	cnt-=dp(true,0,10,10);
	cout<<cnt<<endl;
	return 0;
}

Compilation message (stderr)

numbers.cpp: In function 'int dp(bool, int, int, int)':
numbers.cpp:8:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |  if(pos==limit.size())return 1;
      |     ~~~^~~~~~~~~~~~~~

• Subtask 1: 12.5 / 25
• Subtask 2: 26.666666666666668 / 75