Compilare: user.cpp: In function ‘lint query(int, int, int, int)’: user.cpp:32:9: warning: variable ‘value’ set but not used [-Wunused-but-set-variable] int value = 0, pos = a - 1, lastpos = -1, lastval = -1; ^~~~~ user.cpp:32:47: warning: unused variable ‘lastval’ [-Wunused-variable] int value = 0, pos = a - 1, lastpos = -1, lastval = -1; ^~~~~~~ user.cpp:35:10: warning: unused variable ‘ok’ [-Wunused-variable] bool ok = false; ^~