Compilare: user.cpp: In function ‘void verif(int, int, int)’: user.cpp:21:28: warning: suggest parentheses around comparison in operand of ‘^’ [-Wparentheses] if ((a & 1) ^ (b & 1) != (k & 1)) SOL = false; ^ user.cpp: In function ‘void vecini(int)’: user.cpp:28:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < H[k].size(); ++i) ^ user.cpp:32:38: warning: suggest parentheses around comparison in operand of ‘^’ [-Wparentheses] if ((sol[k] >> bit & 1) ^ 1 == (c_k & 1)) ^ user.cpp: In function ‘int main()’: user.cpp:66:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < H[i].size(); ++j) ^ user.cpp:68:55: warning: suggest parentheses around comparison in operand of ‘^’ [-Wparentheses] if ((sol[H[i][j].first] >> bit & 1) ^ 1 == (c_k & 1)) sol[i] += (1 << bit); ^ user.cpp:44:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bazaconii.in","r",stdin); ^ user.cpp:45:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bazaconii.out","w",stdout); ^ user.cpp:47:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (scanf("%d", &T); T ; --T) ^ user.cpp:52:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (scanf("%d %d", &N, &M) , i = 1; i <= M; ++i) ^ user.cpp:54:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &a, &b, &k); ^