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View Compilation Error

0_0_30469083_12204.cpp: In function 'long long int solve(long long int)':
0_0_30469083_12204.cpp:34:2: error: 'r' was not declared in this scope
  r
  ^
0_0_30469083_12204.cpp:34:2: error: expected '}' at end of input


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