Compilare: user.cpp: In function ‘void Citire()’: user.cpp:15:17: warning: unused variable ‘l’ [-Wunused-variable] int i, x, y, c, l, j; ^ user.cpp: In function ‘bool ok(int)’: user.cpp:64:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++){ ^ user.cpp: In function ‘void Citire()’: user.cpp:18:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d\n",&N,&M); ^ user.cpp:22:22: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,24,f); ^