67 lines
1.6 KiB
C++
67 lines
1.6 KiB
C++
#include <math.h>
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#include <string>
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#include <stdio.h>
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#include <string.h>
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using namespace std;
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typedef long long LL;
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typedef pair< int,pair<LL,LL> > PILL;
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#define F first
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#define S second
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#define MP make_pair
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const int mod = 1e9 + 7;
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int digit[20];
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LL pow10[20];
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PILL dp[20][7][7][2];
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bool vis[20][7][7][2];
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PILL dfs(int len,int sum,int remain,bool contain,bool fp)
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{
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if(!len)
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if(!contain && sum && remain)
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return MP(1,MP(0LL,0LL));
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else
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return MP(0,MP(0LL,0LL));
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if(!fp && vis[len][sum][remain][contain])
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return dp[len][sum][remain][contain];
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PILL ret = MP(0,MP(0,0));
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int fpmax = fp ? digit[len] : 9;
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for(int i=0;i<=fpmax;i++)
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{
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PILL nxt = dfs(len-1,(sum + i) % 7,(remain * 10 + i) % 7,contain | (i == 7),fp && i == fpmax);
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LL pref = i * pow10[len-1] % mod;
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(ret.F += nxt.F) %= mod;
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(ret.S.F += nxt.S.F + pref * nxt.F) %= mod;
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(ret.S.S += nxt.S.S + pref * pref % mod * nxt.F + 2 * pref * nxt.S.F) %= mod;
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}
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if(!fp)
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{
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vis[len][sum][remain][contain] = true;
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dp[len][sum][remain][contain] = ret;
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}
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return ret;
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}
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long long f(long long n)
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{
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int len = 0;
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while(n)
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{
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digit[++len] = n % 10;
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n /= 10;
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}
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return dfs(len,0,0,0,true).S.S;
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}
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int main()
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{
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pow10[0] = 1;
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for(int i=1;i<20;i++)
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pow10[i] = pow10[i-1] * 10 % mod;
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int T;
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scanf("%d",&T);
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while(T--)
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{
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long long a,b;
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scanf("%I64d%I64d",&a,&b);
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printf("%I64d\n",(f(b) - f(a-1) + mod) % mod);
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}
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return 0;
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}
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