Compilare: user.cpp: In function ‘void Solve()’: user.cpp:61:16: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if ( OK ( xi , yi) ) ^ user.cpp: In function ‘void Read()’: user.cpp:29:72: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d%d%d%d%d%d" , &n , &K1 , &K2 , &L1 , &C1 , &L2 , &C2 ); ^ user.cpp:33:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d" , &a[i][j] ); ^ user.cpp: In function ‘int main()’: user.cpp:84:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( IN , "r" , stdin ); ^ user.cpp:85:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( OUT , "w" , stdout ); ^