#include #include using namespace std; using i64 = int64_t; constexpr int mod0 = 1'000'000'000, mod1 = 1'000'000'007; int cmp(int x, int y) { if(x < y) { return 0; } if(x == y) { return 1; } return 2; } i64 f(const string &s, int mod) { // dp[未満/丁度/超過 上から][未満/丁度/超過 下から] := パターン数 int n = static_cast(s.size()); vector> dp(3, vector(3, 0)), ndp; dp[1][1] = 1; for(int i=0; i<=n-1-i; ++i) { ndp.assign(3, vector(3, 0)); for(int state0=0; state0<3; ++state0) { for(int state1=0; state1<3; ++state1) { if(!dp[state0][state1]) { continue; } for(int d=(i==0); d<10; ++d) { // ちょうど n 桁にする int nstate0 = state0, nstate1 = cmp(d, s[n-1-i]-'0'); if(nstate0 == 1) { nstate0 = cmp(d, s[i]-'0'); } if(nstate1 == 1) { nstate1 = state1; } if(nstate0 == 2) { continue; } ndp[nstate0][nstate1] += dp[state0][state1]; ndp[nstate0][nstate1] %= mod; } } } swap(dp, ndp); } i64 res = 0; for(int state1=0; state1<3; ++state1) { res += dp[0][state1]; res %= mod; } for(int state1=0; state1<2; ++state1) { res += dp[1][state1]; res %= mod; } return res; } vector p10; i64 solve(const string &s, int mod) { int n = static_cast(s.size()); p10.assign(n+5, 0); p10[0] = 1; for(int i=0; i> s; i64 res0 = solve(s, mod0), res1 = solve(s, mod1); cout << res0 << '\n' << res1 << '\n'; return 0; }