Compilare: user.cpp: In function ‘void DFS1()’: user.cpp:25:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(idx[x] < L[x].size()){ ^ user.cpp: In function ‘int main()’: user.cpp:99:11: warning: unused variable ‘x’ [-Wunused-variable] int i,x,y; ^ user.cpp:99:13: warning: unused variable ‘y’ [-Wunused-variable] int i,x,y; ^ user.cpp:101:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&N); ^ user.cpp:104:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&qx[i],&qy[i]); ^