Compilare: user.cpp: In function ‘int BS(int)’: user.cpp:15:15: warning: unused variable ‘mid’ [-Wunused-variable] int st,dr,mid,sol; ^ user.cpp:15:19: warning: unused variable ‘sol’ [-Wunused-variable] int st,dr,mid,sol; ^ user.cpp: In function ‘int main()’: user.cpp:46:13: warning: unused variable ‘cnt’ [-Wunused-variable] int cnt=0; ^ user.cpp: In function ‘int BS(int)’: user.cpp:32:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:35:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("s2c.in","r",stdin); ^ user.cpp:36:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("s2c.out","w",stdout); ^ user.cpp:37:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp:40:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:43:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^