1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
#include <cstdio>
#include <cstring>

char A[1000001], B[1000001], C[1000001];

int main(void) {
  scanf("%s%s%s", A, B, C);
  int n = strlen(A);
  int p = 0, l = 0;
  long long s = 0;
  for (int i = n-1; i >= 0; i--) {
    int d = A[i]+B[i]-C[i]-'0';
    switch (d) {
      case 0:
      if (p) l = 0;
      s += ++l, p = 0;
      break;
      case -1:
      if (!p) l = 0;
      else s += ++l, p = 0;
      break;
      case 10:
      if (p) l = 0;
      p = 1;
      break;
      case 9:
      if (!p) l = 0;
      break;
      default:
      p = 0, l = 0;
    }
  }
  printf("%lld\n", s);
}