Compilare: user.cpp: In function ‘int main()’: user.cpp:55:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<G[r].size()&&!(G[r][j].v0==dif0&&G[r][j].v1==dif1&&G[r][j].v2==dif2)) ^ user.cpp:57:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j<G[r].size()){ ^ user.cpp:22:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d" ,&n,&m); ^ user.cpp:26:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d" ,&x); ^