Compilare: main.cpp: In function 'int main()': main.cpp:47:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ main.cpp:49:86: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &edges[i].second.first, &edges[i].second.second, &edges[i].first); ^