Compilare: user.cpp: In function ‘void back(int)’: user.cpp:48:33: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if(x!=0&y!=0&&x<=n&&y<=m) ^ user.cpp:30:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(pp==1) ^ user.cpp: In function ‘int main()’: user.cpp:73:33: 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:74:35: 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:75:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&nr); ^ user.cpp:78:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&v[i].x,&v[i].y); ^