Käännöt

#include <iostream>
using namespace std;
const long long M=1000000007;

long long secret[101010];
long long sdd[101010];
long long s11[101010];
long long s10[101010];
long long ssdd[101010];


string s;


int main(){
  ios_base::sync_with_stdio(0); cin.tie(0);
  
  
  for (int i=1; i<101010; ++i){
    s11[i]=s11[i-1]*10+1;
    s11[i]%=M;
  }
  s10[0]=1;
  for (int i=1; i<101010; ++i){
    s10[i]=s10[i-1]*10;
    s10[i]%=M;
  }
  
  cin >> s;
  long long N=s.size();
  
  sdd[1]=(s11[N-2]*10)%M;
  ssdd[1]=N-2;
  for (int i=2; i<(N+1)/2; ++i){
    sdd[i]=(sdd[i-1]+(s11[N-2*i]*s10[i])%M)%M;
    ssdd[i]=ssdd[i-1]+N-2*i;
  }
  
  
  long long srt=(N*(N-1)/2+N);
  for (int i=0; i<N; ++i){
    int di=min(i, (int)N-i-1);
    
    secret[i]=(s11[N]+sdd[di])%M;
    secret[i]+=(s10[N-i-1]*((srt-N-ssdd[di])%M))%M;
    secret[i]%=M;
  }
  
  long long ans=0;
  for (int i=0; i<N; ++i){
    ans+=(secret[i]*(s[i]-'0'))%M;
    ans%=M;
  }
  cout << ans << endl;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED