Submission #154816

#	Time	Username	Problem	Language	Result	Execution time	Memory
154816		liwi	Palindrome-Free Numbers (BOI13_numbers)	C++11	100 / 100	3 ms	636 KiB

numbers

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;
typedef tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update> ordered_set;

#define scan(x) do{while((x=getchar())<'0'); for(x-='0'; '0'<=(_=getchar()); x=(x<<3)+(x<<1)+_-'0');}while(0)
char _;
#define complete_unique(a) a.erase(unique(a.begin(),a.end()),a.end())
#define all(a) a.begin(),a.end()
#define println printf("\n");
#define readln(x) getline(cin,x);
#define pb push_back
#define endl "\n"
#define INT_INF 0x3f3f3f3f
#define LL_INF 0x3f3f3f3f3f3f3f3f
#define MOD 1000000007
#define MOD2 1494318097
#define SEED 131
#define mp make_pair
#define fastio cin.tie(0); cin.sync_with_stdio(0);

#define MAXD 20

typedef unsigned long long ull;
typedef long long ll;
typedef long double ld;
typedef unordered_map<int,int> umii;
typedef pair<int,int> pii;
typedef pair<double,double> pdd;
typedef pair<ll,ll> pll;
typedef pair<int,pii> triple;
typedef int8_t byte;

mt19937 g1(time(0));

int randint(int a, int b){return uniform_int_distribution<int>(a, b)(g1);}
ll randlong(ll a,ll b){return uniform_int_distribution<long long>(a, b)(g1);}

ll gcd(ll a, ll b){return b == 0 ? a : gcd(b, a % b);}
ll lcm(ll a, ll b){return a*b/gcd(a,b);}
ll fpow(ll  b, ll exp, ll mod){if(exp == 0) return 1;ll t = fpow(b,exp/2,mod);if(exp&1) return t*t%mod*b%mod;return t*t%mod;}
ll divmod(ll i, ll j, ll mod){i%=mod,j%=mod;return i*fpow(j,mod-2,mod)%mod;}

int dig[MAXD];
ll a,b,dp[MAXD][MAXD][MAXD][2][2];

ll solve(int pos, int l2, int l1, int lim, int zero){
	if(pos == 0) return 1;
	if(dp[pos][l2][l1][lim][zero] != -1) return dp[pos][l2][l1][lim][zero];
	int up = lim?dig[pos]:9;
	ll res = 0;
	for(int d=0; d<=up; d++){
		int nl = lim&&(d==up), zz = zero&&(d==0);
		if(l2 == d || l1 == d) continue;
		if(zz) res+=solve(pos-1,10,10,nl,zz);
		else res+=solve(pos-1,l1,d,nl,zz);
	}
	return dp[pos][l2][l1][lim][zero] = res;
}

inline ll init(ll n){
	memset(dp,-1,sizeof dp);
	int cc = 0;
	while(n){
		dig[++cc] = (int)(n%10);
		n/=10;
	}
	return solve(cc,10,10,1,1);
}

int main(){
	scanf("%lld %lld",&a,&b);
	if(a == 0) printf("%lld\n",init(b));
	else printf("%lld\n",init(b)-init(a-1));
}

Compilation message (stderr)

numbers.cpp: In function 'int main()':
numbers.cpp:75:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld %lld",&a,&b);
  ~~~~~^~~~~~~~~~~~~~~~~~~

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