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View Compilation Error

0_0_33178813_10879.cpp: In function 'int main()':
0_0_33178813_10879.cpp:180:52: error: 'so' was not declared in this scope
         int ind = unique(sol.begin(), sol.end()) - so
                                                    ^
0_0_33178813_10879.cpp:180:52: error: expected ',' or ';' at end of input
0_0_33178813_10879.cpp:180:52: error: expected '}' at end of input
0_0_33178813_10879.cpp:180:52: error: expected '}' at end of input


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