Compilare: user.cpp: In function ‘int bf()’: user.cpp:21:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<l[x].size();i++) ^ user.cpp: In function ‘void dinic()’: user.cpp:43:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<l[d].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:96:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<r1.size();i++) ^ user.cpp:70:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,x,y,e; ^ user.cpp:72:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fo,"%d %d %d",&n,&m,&e); ^ user.cpp:76:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fo,"%d %d",&x,&y); ^