Compilare: user.cpp: In function ‘void back(int)’: user.cpp:34:15: warning: unused variable ‘j’ [-Wunused-variable] int i,j,x,y,k,sx,sy; ^ user.cpp: In function ‘int main()’: user.cpp:67:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,x,y; ^ user.cpp: In function ‘void afis()’: user.cpp:20:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("immortal.out", "w", stdout); ^ user.cpp: In function ‘int main()’: user.cpp:66:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("immortal.in", "r", stdin); ^ user.cpp:68:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&n, &m, &im); ^ user.cpp:70:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x, &y); ^