Compilare: user.cpp: In function ‘int main()’: user.cpp:65:17: warning: unused variable ‘k’ [-Wunused-variable] int n,m,i,j,k,x,y,x1,y1,f=1,t=0,a,b,r,ok=0; ^ user.cpp:65:29: warning: unused variable ‘f’ [-Wunused-variable] int n,m,i,j,k,x,y,x1,y1,f=1,t=0,a,b,r,ok=0; ^ user.cpp:65:37: warning: unused variable ‘a’ [-Wunused-variable] int n,m,i,j,k,x,y,x1,y1,f=1,t=0,a,b,r,ok=0; ^ user.cpp:65:39: warning: unused variable ‘b’ [-Wunused-variable] int n,m,i,j,k,x,y,x1,y1,f=1,t=0,a,b,r,ok=0; ^ user.cpp:65:41: warning: unused variable ‘r’ [-Wunused-variable] int n,m,i,j,k,x,y,x1,y1,f=1,t=0,a,b,r,ok=0; ^ user.cpp:65:43: warning: unused variable ‘ok’ [-Wunused-variable] int n,m,i,j,k,x,y,x1,y1,f=1,t=0,a,b,r,ok=0; ^ user.cpp:63:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("padure.in","r",stdin); ^ user.cpp:64:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("padure.out","w",stdout); ^ user.cpp:66:46: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d%d",&n,&m,&x,&y,&x1,&y1); ^ user.cpp:73:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&(v[i][j])); ^