Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:69:9: warning: unused variable ‘act’ [-Wunused-variable] int act; ^ user.cpp: In function ‘int main()’: user.cpp:154:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&n); ^ user.cpp:160:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&a,&b); ^