Compilare: user.cpp: In function ‘int main()’: user.cpp:68:19: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if(v[i][1] & l == 0 ) {k=0;break;} ^ user.cpp:69:19: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if(v[i][n] & r == 0 ) {k=0;break;} ^ user.cpp:74:19: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if(v[1][j] & u == 0 ) {k=0;break;} ^ user.cpp:75:19: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if(v[m][j] & d == 0 ) {k=0;break;} ^ user.cpp:52:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("verlab.in","r",stdin); ^ user.cpp:53:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("verlab.out","w",stdout); ^ user.cpp:54:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp:61:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&m,&n); ^ user.cpp:65:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i][j]); ^