Compilare: user.cpp: In function ‘int main()’: user.cpp:77:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d%d%d",&Case,&N,&M,&T); ^ user.cpp:80:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d",&tr[i].x,&tr[i].y); ^ user.cpp:87:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&L); ^ user.cpp:93:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&Q); ^ user.cpp:96:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&k); ^ In file included from /usr/include/string.h:642:0, from /usr/include/c++/4.8/cstring:42, from user.cpp:1: In function ‘void* memcpy(void*, const void*, size_t)’, inlined from ‘int Simulate(int)’ at user.cpp:45:28: /usr/include/i386-linux-gnu/bits/string3.h:52:71: warning: call to void* __builtin___memcpy_chk(void*, const void*, unsigned int, unsigned int) will always overflow destination buffer [enabled by default] return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest)); ^