Compilare: user.cpp: In function ‘int main()’: user.cpp:61:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:64:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", arr[i].s); ^ user.cpp: In function ‘long long int query(int, int, int)’: user.cpp:33:5: warning: ‘p2’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int i = startn; i<= endn; ++i) ^ user.cpp:30:9: warning: ‘p1’ may be used uninitialized in this function [-Wmaybe-uninitialized] int p1, p2; ^