Compilare: user.cpp: In function ‘void Query()’: user.cpp:71:15: warning: unused variable ‘t’ [-Wunused-variable] int k, i, t, len; ^ user.cpp:72:10: warning: unused variable ‘ok’ [-Wunused-variable] bool ok; ^ user.cpp: In function ‘void Read_and_Set()’: user.cpp:15:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", S1); scanf("%s", S2); ^ user.cpp:15:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", S1); scanf("%s", S2); ^ user.cpp: In function ‘void Query()’: user.cpp:74:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", Q); len = strlen(Q); ^ user.cpp: In function ‘int main()’: user.cpp:122:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &m); ^