Compilare: user.cpp: In function ‘int main()’: user.cpp:30:13: warning: unused variable ‘st’ [-Wunused-variable] int i,j,st,dr,sol=0,nr,k,q,poz; ^ user.cpp:30:16: warning: unused variable ‘dr’ [-Wunused-variable] int i,j,st,dr,sol=0,nr,k,q,poz; ^ user.cpp:30:32: warning: unused variable ‘poz’ [-Wunused-variable] int i,j,st,dr,sol=0,nr,k,q,poz; ^ user.cpp:31:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("peri.in","r",stdin); ^ user.cpp:32:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("peri.out","w",stdout); ^ user.cpp:33:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n,&m); ^ user.cpp:37:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i][j]); ^