Compilare: user.cpp: In function ‘int main()’: user.cpp:41:12: warning: unused variable ‘a’ [-Wunused-variable] int n, a, b, x, y; ^ user.cpp:41:15: warning: unused variable ‘b’ [-Wunused-variable] int n, a, b, x, y; ^ user.cpp:41:18: warning: unused variable ‘x’ [-Wunused-variable] int n, a, b, x, y; ^ user.cpp:41:21: warning: unused variable ‘y’ [-Wunused-variable] int n, a, b, x, y; ^ user.cpp:39:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zone.in", "r", stdin); ^ user.cpp:40:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zone.out", "w", stdout); ^ user.cpp:43:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:45:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld",&sms[i]); ^ user.cpp:48:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld",&asp[i][j]); ^ user.cpp: In function ‘void pop(int, int, int, int)’: user.cpp:30:17: warning: array subscript is above array bounds [-Warray-bounds] if(sms[i]==val) { ^