Compilare: main.cpp: In function 'void Dijkstra()': main.cpp:36:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<=N; ++i)MinD[i]=Inf; ~^~~ main.cpp:44:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<=A[a][0].Node; ++i){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:27:39: 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); ^ main.cpp:28:41: 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); ^ main.cpp: In function 'void Read()': main.cpp:61:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ main.cpp:68:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &z); ^