Compilare: main.cpp: In function 'int main()': main.cpp:41:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:43:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &cost[i]); ^ main.cpp:47:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &u, &v); ^ main.cpp:61:39: warning: 'R2' may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d\n", min(dfs(R1, 0), dfs(R2, 0))); ~~~^~~~~~~ main.cpp:61:27: warning: 'R1' may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d\n", min(dfs(R1, 0), dfs(R2, 0))); ~~~^~~~~~~