Compilare: user.cpp: In function ‘void kruskal()’: user.cpp:61:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(sol.size()<n-1) ^ user.cpp:60:9: warning: unused variable ‘i’ [-Wunused-variable] int i=0,k=0; ^ user.cpp:60:13: warning: unused variable ‘k’ [-Wunused-variable] int i=0,k=0; ^ user.cpp: In function ‘void citire()’: user.cpp:27:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:31:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&u.x,&u.y,&u.cost); ^ user.cpp: In function ‘int main()’: user.cpp:87:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.in","r",stdin); ^ user.cpp:88:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.out","w",stdout); ^