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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. typedef long long iint;
  4.  
  5. int main() {
  6.     string s;
  7.     cin >> s;
  8.     string tmp = "";
  9.     int streak = 0;
  10.     int maxstreak = 0;
  11.     // ATTCG
  12.     for (char c : s) {
  13.         if (tmp == "") {
  14.             tmp += c;
  15.             streak++;
  16.             maxstreak = max(streak, maxstreak);
  17.         } else {
  18.             string temp = "" + c;
  19.             if (temp == tmp) {
  20.                 streak++;
  21.                 tmp = temp;
  22.                 maxstreak = max(streak, maxstreak);
  23.             } else {
  24.                 streak = 1; 
  25.                 tmp = temp;
  26.             }
  27.  
  28.         }
  29.     }
  30.     cout << maxstreak;
  31. }
Success #stdin #stdout 0.01s 5320KB
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stdin
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AAAAAAAAAA
stdout
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9
https://ideone.com/7U1plh
language:
C++14 (gcc 8.3)
created:
3 hours ago
visibility:
public

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