Compilare: user.cpp: In function ‘int main()’: user.cpp:40:16: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if ((a[i][j]==0 && a[i][j-1]==1) || (a[i][j]==0 && a[i][j+1]==1)) ^ user.cpp:11:21: warning: unused variable ‘z’ [-Wunused-variable] int v,p,s,c,x,y,z; ^ user.cpp:7:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("defrag.in","r",stdin); ^ user.cpp:13:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&v); ^ user.cpp:14:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n",&p,&s); ^ user.cpp:15:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&c); ^ user.cpp:18:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n",&x,&y); ^