Compilare: user.cpp: In function ‘void read()’: user.cpp:78:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k<G[j].size(); k++) ^ user.cpp: In function ‘void solve(int)’: user.cpp:98:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i<G[nod].size(); i++) ^ user.cpp: In function ‘void read()’: user.cpp:18:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:71:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ user.cpp:88:56: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &xstart, &ystart, &xstop, &ystop); ^