Compilare: user.cpp: In function ‘int main()’: user.cpp:29:28: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] x = d[ !l ][ j - 1 ] + a * 2 << (j-1); ^ user.cpp:32:24: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] x = d[ !l ][ j ] + b * 2 << j; ^ user.cpp:11:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hacker3.in", "r",stdin); ^ user.cpp:12:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hacker3.out", "w",stdout); ^ user.cpp:13:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:23:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &b); ^