Compilare: main.cpp: In function 'int main()': main.cpp:101:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("wwt.in", "r", stdin); ^ main.cpp:102:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("wwt.out", "w", stdout); ^ main.cpp:103:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^ main.cpp:104:68: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] for (int i = 0; i < n; i++) scanf("%d", &ownedby[i]), ownedby[i]--; ^