Compilare: user.cpp: In function ‘int main()’: user.cpp:73:36: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if((1 << (a[j][k]) - 1) & i) ^ user.cpp:74:43: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] aux -= 1 << (a[j][k]) - 1; ^ user.cpp:53:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("boom.in", "r", stdin); ^ user.cpp:54:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("boom.out", "w", stdout); ^ user.cpp:56:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:60:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &p[i], &w[i]); ^ user.cpp:62:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i][j]); ^