Compilare: user.cpp: In function ‘int main()’: user.cpp:20:5: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation] for(int i=2;i<=n;i++) ^~~ user.cpp:22:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘for’ q.push({0,1}); ^ user.cpp:30:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<frunza[ind].size();i++) ~^~~~~~~~~~~~~~~~~~~ user.cpp:12:37: 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:13:39: 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); ^ user.cpp:14:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:17:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&l); ^