Compilare: user.cpp: In function ‘int main(int, const char**)’: user.cpp:51:24: warning: unused variable ‘k’ [-Wunused-variable] int a[25][25], i , j, k, n, m, s, ok, r; ^ user.cpp:51:33: warning: unused variable ‘s’ [-Wunused-variable] int a[25][25], i , j, k, n, m, s, ok, r; ^ user.cpp:51:36: warning: unused variable ‘ok’ [-Wunused-variable] int a[25][25], i , j, k, n, m, s, ok, r; ^ user.cpp:51:40: warning: unused variable ‘r’ [-Wunused-variable] int a[25][25], i , j, k, n, m, s, ok, r; ^ user.cpp:48:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("spirala.in","r",stdin); ^ user.cpp:49:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("spirala.out","w",stdout); ^