Compilare: main.cpp: In function 'void gen_arb()': main.cpp:60:9: warning: unused variable 'k' [-Wunused-variable] { int k=0; ^ main.cpp: In function 'void dfs3(int, int)': main.cpp:89:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int goo(int, int)': main.cpp:120:9: warning: unused variable 'i' [-Wunused-variable] { int i, ans=0; ^ main.cpp: In function 'void read()': main.cpp:16:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&m); ^ main.cpp:19:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&x,&y); ^ main.cpp: In function 'void solve()': main.cpp:140:22: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&m); ^ main.cpp:143:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&x,&y); ^