0_0_20474971_3001.cpp: In function 'void quicksort(int*, int, int)':
0_0_20474971_3001.cpp:12:13: error: 'data' was not declared in this scope
data[l] = data[r];
^
0_0_20474971_3001.cpp:16:9: error: 'data' was not declared in this scope
data[l] = k;
^
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