Compilare: user.cpp: In function ‘void Read()’: user.cpp:44:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘void binSearch()’: user.cpp:124:17: warning: unused variable ‘left’ [-Wunused-variable] int step=30,left,right;sort(Edge+1,Edge+M+1,cmp3); ^ user.cpp:124:22: warning: unused variable ‘right’ [-Wunused-variable] int step=30,left,right;sort(Edge+1,Edge+M+1,cmp3); ^ user.cpp: In function ‘int main()’: user.cpp:157:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("luff.out","w",stdout); ^