Compilare: main.cpp: In function 'int main()': main.cpp:45:32: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] if(mask & (1 << i) == 0 || gr[i] % 2 == 0) continue; ~~~~~~~~~^~~~ main.cpp: In function 'void read()': main.cpp:15:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ main.cpp:21:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &a, &b, &x); ^ main.cpp: In function 'int main()': main.cpp:31:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mmo.in", "r", stdin); ^ main.cpp:32:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mmo.out", "w", stdout); ^