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View Compilation Error

0_0_19201133_31820.cpp: In function 'int main()':
0_0_19201133_31820.cpp:22:18: error: cannot pass objects of non-trivially-copyable type 'std::string {aka class std::basic_string<char>}' through '...'
    scanf("%s",str);
                  ^
0_0_19201133_31820.cpp:42:27: error: cannot pass objects of non-trivially-copyable type 'std::string {aka class std::basic_string<char>}' through '...'
             scanf("%s",str);
                           ^


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