Compilare: main.cpp: In member function 'int Tree::nrPairs(int)': main.cpp:59:9: warning: unused variable 'sum' [-Wunused-variable] int sum = 0, best = bst[nod]; ^~~ main.cpp: In function 'int main()': main.cpp:96:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ main.cpp:99:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:104:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &u, &v); ^