Compilare: user.cpp: In function ‘int main()’: user.cpp:99:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0,printf("%d ",way.size());i<way.size();++i) ^ user.cpp:105:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0,printf("%d ",way.size());i<way.size();++i) ^ user.cpp:111:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0,printf("%d ",way.size());i<way.size();++i) ^ user.cpp:73:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trilant.in","r",stdin); ^ user.cpp:74:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trilant.out","w",stdout); ^ user.cpp:76:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d",&N,&M,&A,&B,&C); ^ user.cpp:79:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&c); ^ user.cpp: In function ‘void get_way(int, int, int)’: user.cpp:68:27: warning: ‘nxt’ may be used uninitialized in this function [-Wmaybe-uninitialized] get_way(_i,nxt,finish); ^