Compilare: user.cpp: In function ‘int main()’: user.cpp:22:11: warning: left operand of comma operator has no effect [-Wunused-value] a,b,cost; ^ user.cpp:22:13: warning: right operand of comma operator has no effect [-Wunused-value] a,b,cost; ^ user.cpp:22:17: warning: right operand of comma operator has no effect [-Wunused-value] a,b,cost; ^ user.cpp:37:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<adj[front].size(); ++i) ^ user.cpp:16:26: warning: unused variable ‘d’ [-Wunused-variable] int a,b,cost,front,i,d; ^ user.cpp:17:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sate.in","r",stdin); ^ user.cpp:18:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sate.out","w",stdout); ^ user.cpp:19:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d",&n,&m,&x,&y); ^ user.cpp:23:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&a,&b,&cost); ^