Eroare de compilare: In file included from /usr/include/_G_config.h:15:0, from /usr/include/libio.h:32, from /usr/include/stdio.h:75, from /usr/include/c++/4.8/cstdio:42, from /usr/include/c++/4.8/ext/string_conversions.h:43, from /usr/include/c++/4.8/bits/basic_string.h:2815, from /usr/include/c++/4.8/string:52, from /usr/include/c++/4.8/bits/locale_classes.h:40, from /usr/include/c++/4.8/bits/ios_base.h:41, from /usr/include/c++/4.8/ios:42, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:1: user.cpp: In function ‘void qsort(int, int)’: user.cpp:41:63: error: second operand to the conditional operator is of type ‘void’, but the third operand is neither a throw-expression nor of type ‘void’ if (low == high - 1) (v[low] > v[high]) ? (swap(high, low)) :NULL; ^ user.cpp: In function ‘int main()’: user.cpp:54:27: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(OUT, "w", stdout); ^ user.cpp: In function ‘void readData()’: user.cpp:23:25: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(IN, "r", stdin); ^ user.cpp:24:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:25:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (int i = 0; i < N; ++i) scanf(" %d", &v[i]); ^