Compilare: main.cpp: In function 'int main()': main.cpp:32:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(i=2;i<=n;i++) ^~~ main.cpp:34:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' for(c.insert({0,1});!c.empty();) ^~~ main.cpp:29:103: 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),freopen("dijkstra.out","w",stdout),fread(r,1,M,stdin),n=A(),m=A(); ^ main.cpp:29:103: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] main.cpp:29:103: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result]