Compilare: main.cpp: In function 'int main()': main.cpp:62:21: warning: unused variable 'j' [-Wunused-variable] int n , m , i , j , q , x1 , y1 , x2 , y2 ; ^ main.cpp:59:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ( "tnia.in" , "r" , stdin ) ; ^ main.cpp:60:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ( "tnia.out" , "w" , stdout ) ; ^ main.cpp:64:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d" , & n , & m ); ^ main.cpp:67:72: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d" , & a [ i ] ) , dp [ i ] = dp [ i - 1 ] + a [ i ] ; ^ main.cpp:69:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d" , & q ) ; ^ main.cpp:73:58: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d%d%d" , & x1 , & y1 , & x2 , & y2 ) ; ^