Compilare: user.cpp: In function ‘int mergemic(int, int, int)’: user.cpp:42:20: warning: unused variable ‘po1’ [-Wunused-variable] else{int b1,b2,po1,po2,nr; ^ user.cpp:42:24: warning: unused variable ‘po2’ [-Wunused-variable] else{int b1,b2,po1,po2,nr; ^ user.cpp: In function ‘int merge(int, int, int)’: user.cpp:108:20: warning: unused variable ‘po1’ [-Wunused-variable] else{int b1,b2,po1,po2,nr; ^ user.cpp:108:24: warning: unused variable ‘po2’ [-Wunused-variable] else{int b1,b2,po1,po2,nr; ^ user.cpp: In function ‘int main()’: user.cpp:156:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("invsort.in","r",stdin); ^ user.cpp:157:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("invsort.out","w",stdout); ^ user.cpp:158:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:161:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^