Compilare: user.cpp: In function ‘bool dfs(int)’: user.cpp:22:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sol.size()==K) ^ user.cpp: In function ‘int main()’: user.cpp:34:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&T); ^ user.cpp:41:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&N,&M,&K); ^ user.cpp:44:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&a,&b); ^ user.cpp:50:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&a); ^ user.cpp:73:18: warning: ‘st’ may be used uninitialized in this function [-Wmaybe-uninitialized] ok=dfs(st); ^