Laskutoimitus

input/code.cpp: In function 'll evalexp(std::string)':
input/code.cpp:22:1: warning: no return statement in function returning non-void [-Wreturn-type]
   22 | }
      | ^
input/code.cpp: In function 'int main()':
input/code.cpp:45:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |   for (int i = 0; i < s.size(); i++) {
      |                   ~~^~~~~~~~~~

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

ll M = 1000000007LL;

ll to_number(const string& s, int l, int r) {
  ll num = 0;
  for (int i = l; i <= r; i++) {
    ll digit = s[i] - 48;
    num *= 10LL;
    num += digit;
    num %= M;
  }
  return num;
}

ll evalexp(string s) {
  if (!isdigit(s[0]) || !isdigit(s[s.size()-1])) {
    
  }
}

#define N 1010101
ll pw[N];

ll pw10[N];

ll ans;
int n;

int main() {
  ios_base::sync_with_stdio(0); cin.tie(0);
  string s; cin>>s;
  n = s.size();

  pw[0] = 1;
  pw10[0] = 1;

  for (int i = 1; i < N; i++) {
    pw10[i] = (pw10[i-1] * 10LL) % M;
    pw[i] = (pw[i-1] + pw10[i]) % M;
  }

  for (int i = 0; i < s.size(); i++) {
    ll to_right = (n - i - 1LL);
    ll base = pw[to_right] * ll(s[i]-48);
    ll lft = i + 1;
    ans += base * lft;
    ans %= M;
  }

  if (ans < 0LL) ans += M;

  cout << ans << "\n";
}

Test 1

Group: 1, 2, 6

Verdict: WRONG ANSWER

Test 2

Group: 1, 2, 6

Verdict: WRONG ANSWER

Test 3

Group: 1, 2, 3, 4, 5, 6

Verdict: ACCEPTED

Test 4

Group: 2, 6

Verdict: WRONG ANSWER

Test 5

Group: 2, 6

Verdict: WRONG ANSWER

Test 6

Group: 2, 3, 4, 5, 6

Verdict: ACCEPTED

Test 7

Group: 6

Verdict: WRONG ANSWER

Test 8

Group: 6

Verdict: WRONG ANSWER

Test 9

Group: 3, 4, 5, 6

Verdict: ACCEPTED

Test 10

Group: 4, 6

Verdict: WRONG ANSWER

Test 11

Group: 4, 6

Verdict: WRONG ANSWER

Test 12

Group: 5, 6

Verdict: WRONG ANSWER

Test 13

Group: 5, 6

Verdict: WRONG ANSWER