Compilare: main.cpp: In function 'void read()': main.cpp:17:46: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%lld%lld", &N, &costAdd, &costRem); ^ main.cpp:19:44: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &sons[i][0], &sons[i][1]); ^ main.cpp: In function 'int main()': main.cpp:83:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("avele.in", "r", stdin); ^ main.cpp:84:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("avele.out", "w", stdout); ^