Compilare: main.cpp: In function 'void update_nod(int)': main.cpp:18:19: warning: unused variable 'sum' [-Wunused-variable] int ls , rs , sum; ^~~ main.cpp: In function 'int query(int, int, int)': main.cpp:79:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:84:42: warning: unused variable 'j' [-Wunused-variable] int n , m , i , op , x , y , maxim , j; ^ main.cpp:82:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("maxq.in" , "r" , stdin); ^ main.cpp:83:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("maxq.out" , "w" , stdout); ^ main.cpp:85:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &n); ^ main.cpp:87:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &v[i]); ^ main.cpp:89:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &m); ^ main.cpp:92:40: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d" , &op , &x , &y); ^