Compilare: user.cpp: In function ‘int main()’: user.cpp:87:46: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] printf("%d", (v[i][j] % 2) xor 0 + (i == n && j % 2 == 1)); ^ user.cpp:22:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hack.in", "r", stdin); ^ user.cpp:23:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hack.out", "w", stdout); ^