Compilare: user.cpp: In function ‘int main()’: user.cpp:117:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("zeap.in", "r", stdin); ^ user.cpp:118:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("zeap.out", "w", stdout); ^ user.cpp:123:18: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets (ax); ^ user.cpp: In function ‘int find(node*, int)’: user.cpp:75:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ /tmp/ccaf09Td.o: In function `main': user.cpp:(.text.startup+0xac): warning: the `gets' function is dangerous and should not be used.