Compilare: main.cpp: In function 'int main()': main.cpp:33:58: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < (1 << m); ++j) if (dp[line - 1][j] != 0xfefefefe) { ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~ main.cpp: In lambda function: main.cpp:40:47: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] if (!((j | add) & ((1 << pos) | (1 << pos - 1)))) ~~~~^~~ main.cpp:41:48: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] bkt(pos + 1, add | (1 << pos) | (1 << pos - 1), cnt + 1); ~~~~^~~