Compilare: user.cpp: In function ‘void Merge(int, int, int)’: user.cpp:24:9: warning: unused variable ‘szx’ [-Wunused-variable] int szx,szy,szz; ^ user.cpp: In function ‘int main()’: user.cpp:150:23: warning: unused variable ‘mid’ [-Wunused-variable] int st,dr,mid,sol; ^ user.cpp:124:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mess.in","r",stdin); ^ user.cpp:125:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mess.out","w",stdout); ^ user.cpp:126:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:129:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&val[i]); ^ user.cpp:142:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&op); ^ user.cpp:145:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^ user.cpp:151:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&pa,&qa,&k); ^ user.cpp:167:39: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d\n",p[sol].first); ^