0_0_12058673_22757.cpp: In function `int main()':
0_0_12058673_22757.cpp:20: error: redeclaration of `int da'
0_0_12058673_22757.cpp:17: error: `int da' previously declared here
0_0_12058673_22757.cpp:21: error: redeclaration of `int xiao'
0_0_12058673_22757.cpp:17: error: `int xiao' previously declared here
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