Compilare: user.cpp: In function ‘int main()’: user.cpp:7:13: warning: unused variable ‘x’ [-Wunused-variable] int n,m,x,y,i,j,s,part,maxim=-1,x1,y1,subm; ^ user.cpp:7:15: warning: unused variable ‘y’ [-Wunused-variable] int n,m,x,y,i,j,s,part,maxim=-1,x1,y1,subm; ^ user.cpp:7:37: warning: unused variable ‘x1’ [-Wunused-variable] int n,m,x,y,i,j,s,part,maxim=-1,x1,y1,subm; ^ user.cpp:7:40: warning: unused variable ‘y1’ [-Wunused-variable] int n,m,x,y,i,j,s,part,maxim=-1,x1,y1,subm; ^ user.cpp:5:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("flip.in","r",stdin); ^ user.cpp:6:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("flip.out","w",stdout); ^ user.cpp:8:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:11:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]); ^