Compilare: main.cpp: In function 'void Dijkstra()': main.cpp:66:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(size_t j=1; j<=List[a][0].Node; ++j){ ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:27:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("catun.in", "r", stdin); ^ main.cpp:28:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("catun.out", "w", stdout); ^ main.cpp: In function 'void Read()': main.cpp:38:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &N, &M, &K); ^ main.cpp:40:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &Fort[i]); ^ main.cpp:49:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &z); ^