Compilare: user.cpp: In function ‘int main()’: user.cpp:105:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[a].size(); i++) ^ user.cpp:80:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,n,m,a,b,c; ^ user.cpp:98:9: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int ok=1; ^ user.cpp:78:37: 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:79:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.out","w",stdout); ^