Compilare: main.cpp: In function 'void dfs(int)': main.cpp:71:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ok==0&&ans.size()<=g) ~~~~~~~~~~^~~ main.cpp: In function 'int main()': main.cpp:125:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<ans.size();i++) ~^~~~~~~~~~~ main.cpp: In function 'void fast()': main.cpp:17:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cartite.in","r",stdin); ^ main.cpp:18:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cartite.out","w",stdout); ^ main.cpp: In function 'int main()': main.cpp:87:52: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d%d",&cerinta,&n,&m,&xc,&yc,&k); ^ main.cpp:91:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&r); ^ main.cpp:99:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&g); ^ main.cpp:103:43: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&x1,&y11,&x2,&y2); ^