Compilare: main.cpp: In function 'void mkSol(int)': main.cpp:53:20: warning: unused variable 'it' [-Wunused-variable] for (const auto &it : rG[v]) ^~ main.cpp: In function 'int main()': main.cpp:61:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ main.cpp:64:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^