Compilare: main.cpp: In function 'int main()': main.cpp:46:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("kdist.in", "r", stdin); ^ main.cpp:47:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("kdist.out", "w", stdout); ^ main.cpp:50:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^ main.cpp:53:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &u, &v); ^ main.cpp:59:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &col[i]); ^ main.cpp: In function 'void dfs(int, int, int)': main.cpp:24:15: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized] int x = -1, y; ^