Compilare: main.cpp: In function 'int dfs(int)': main.cpp:26:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:30:15: warning: unused variable 't' [-Wunused-variable] long long t,i,j,k=0,m; ^ main.cpp:30:19: warning: unused variable 'j' [-Wunused-variable] long long t,i,j,k=0,m; ^ main.cpp:30:21: warning: unused variable 'k' [-Wunused-variable] long long t,i,j,k=0,m; ^ main.cpp:31:15: warning: unused variable 'x1' [-Wunused-variable] long long x1,y1,x2,y2,pas,val,n; ^~ main.cpp:31:18: warning: unused variable 'y1' [-Wunused-variable] long long x1,y1,x2,y2,pas,val,n; ^~ main.cpp:31:21: warning: unused variable 'x2' [-Wunused-variable] long long x1,y1,x2,y2,pas,val,n; ^~ main.cpp:31:24: warning: unused variable 'y2' [-Wunused-variable] long long x1,y1,x2,y2,pas,val,n; ^~ main.cpp:31:27: warning: unused variable 'pas' [-Wunused-variable] long long x1,y1,x2,y2,pas,val,n; ^~~ main.cpp:31:31: warning: unused variable 'val' [-Wunused-variable] long long x1,y1,x2,y2,pas,val,n; ^~~