Compilare: user.cpp: In function ‘int main()’: user.cpp:27:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<dq.size(); ++i) ^ user.cpp:34:19: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(a[i][j]==a[i+1][j]+1||a[i][j]==a[i+1][j]-1||b[i][j]==b[i+1][j]+1||b[i][j]==b[i+1][j]-1) ^ user.cpp:8:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zona.in","r",stdin); ^ user.cpp:9:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zona.out","w",stdout); ^ user.cpp:10:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&x,&y,&n,&q); ^ user.cpp:16:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&c); ^