#include <bits/stdc++.h> using namespace std; #define pb push_back #define int long long const int inf = 12345; const int mod = 998244353; void opd(){ freopen("in.txt", "r", stdin); freopen("out.txt", "w", stdout); } struct BIT{ int n; vector<int> ft; void init(int N){ n = N; ft.assign(n + 1, 0); } void add(int pos, int val){ while (pos <= n) { ft[pos] += val; pos += pos & -pos; } } int get(int pos){ int res = 0; while (pos > 0) { res += ft[pos]; pos -= pos & -pos; } return res; } }; struct DSU { vector<int>par, siz; int n; DSU(int N) { n = N + 5; par.resize(n + 1, 0); siz.assign(n + 1, 1); for(int i = 0; i <= n; ++i) par[i] = i; } int _find(int v) { if(par[v] == v) return v; return par[v] = _find(par[v]); } bool unite(int a, int b) { a = _find(a); b = _find(b); if(a != b) { if(siz[a] < siz[b]) swap(a, b); siz[a] += siz[b]; par[b] = a; return 1; } return 0; } }; int dp[20][12][12][2]; int rec(string &s, int pos,int d1,int d2,int f){ if(pos==s.size()){ return 1; } if(dp[pos][d1][d2][f]!=-1){ return dp[pos][d1][d2][f]; } int res=0; if(!d2){ res += rec(s, pos+1, d1, d2, 0); } int st = 1 + (!d2?1:0); if(!f){ for(int d3=st;d3<11;++d3){ if(d3!=d1 && d3!=d2){ res += rec(s, pos+1, d2, d3, 0); } } } else{ int d=s[pos]-'0'+1; for(int d3=st;d3<=d;++d3){ if(d3!=d1 && d3!=d2){ if(d3==d){ res+=rec(s, pos+1, d2, d3, 1); }else{ res+=rec(s, pos+1, d2, d3, 0); } } } } return dp[pos][d1][d2][f]=res; } int calc(int a){ if(a<0){ return 0; } for(int i=0;i<20;++i){ for(int j=0;j<12;++j){ for(int k=0;k<12;++k){ dp[i][j][k][0]=-1; dp[i][j][k][1]=-1; } } } string s = to_string(a); return rec(s, 0, 0, 0, 1); } void solve(){ int a, b; cin >> a >> b; cout << calc(b) - calc(a-1) << endl; } signed main(){ ios::sync_with_stdio(0); cin.tie(0); //opd(); int T = 1; while(T--){ solve(); } }

numbers.cpp: In function 'void opd()':
numbers.cpp:8:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |     freopen("in.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
numbers.cpp:9:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     freopen("out.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~