Compilare: user.cpp: In function ‘int main()’: user.cpp:44:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<m[nod].size();i++) ^ user.cpp: In function ‘void initialization()’: user.cpp:19:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cezar.in","r",stdin); ^ user.cpp:20:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cezar.out","w",stdout); ^ user.cpp:21:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:24:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n1,&n2); ^ user.cpp: In function ‘int main()’: user.cpp:49:37: warning: ‘n2’ may be used uninitialized in this function [-Wmaybe-uninitialized] cost[n2]+=cost[nod]; ^