Compilare: main.cpp: In function 'int main()': main.cpp:54:40: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses] mat[i & 1][j] += mat[i & 1 ^ 1][j] + mat[i & 1][j - 1] - mat[i & 1 ^ 1][j - 1]; ~~^~~ main.cpp:54:80: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses] mat[i & 1][j] += mat[i & 1 ^ 1][j] + mat[i & 1][j - 1] - mat[i & 1 ^ 1][j - 1]; ~~^~~ main.cpp:27:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("agora.in", "r", stdin); ^ main.cpp:28:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("agora.out", "w", stdout); ^