Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:14:20: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] used |= 1<<node-1; ^ user.cpp:16:45: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if (G[node][i] && (sm&(1<<G[node][i]-1)) && !(used&(1<<i-1))) ^ user.cpp:16:65: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if (G[node][i] && (sm&(1<<G[node][i]-1)) && !(used&(1<<i-1))) ^ user.cpp: In function ‘int main()’: user.cpp:59:32: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] for (sm = 0; sm < (1<<N-1); sm++) { ^ user.cpp:63:33: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if (!(used&(1<<i-1))) ^