Compilare: user.cpp: In function ‘int main()’: user.cpp:19:28: warning: format ‘%Ld’ expects argument of type ‘long long int*’, but argument 3 has type ‘long int*’ [-Wformat=] scanf("%ld %Ld", &N, &M); ^ user.cpp:32:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[crt].size(); i++) { ^ user.cpp:16:13: warning: unused variable ‘j’ [-Wunused-variable] long i, j, crt; ^ user.cpp:17:39: 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:18:41: 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); ^ user.cpp:19:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %Ld", &N, &M); ^ user.cpp:21:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld %ld", &a, &b, &l); ^