Compilare: user.cpp: In function ‘int main()’: user.cpp:27:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;i++) c[i].resize(n+1,Inf); ^ user.cpp:28:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=m;i++) ^ user.cpp:34:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=2;i<=n;i++) cout<<d[i]<<" "; ^ user.cpp:25:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,x,y,k; ^ user.cpp: In function ‘void dijkstra(int)’: user.cpp:48:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;i++) ^ user.cpp:49:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(!viz[i]&&d[i]<Min) ^ user.cpp:58:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;i++) ^ user.cpp:40:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,Min,k; ^ user.cpp: In function ‘int main()’: user.cpp:22:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.in","r",stdin); ^ user.cpp:23:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.out","w",stdin); ^