Compilare: user.cpp: In function ‘void build_rmq()’: user.cpp:19:36: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] lg[i] = lg[i-1] + int(!(i&i-1)); ^ user.cpp:25:31: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] for(int j=1; j<=buff-(1<<i-1); ++j) { ^ user.cpp:27:30: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if(h[rmq[i-1][j+(1<<i-1)]] < h[rmq[i][j]]) ^ user.cpp:28:41: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] rmq[i][j] = rmq[i-1][j+(1<<i-1)]; ^ user.cpp: In function ‘int lca(int, int)’: user.cpp:39:44: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if(h[ rmq[ lg[b-a+1] ][ b-(1<<lg[b-a+1]-1)+1 ] ] < h[ans]) ^ user.cpp:40:48: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] ans = rmq[ lg[b-a+1] ][ b-(1<<lg[b-a+1]-1)+1 ]; ^ user.cpp: In function ‘int main()’: user.cpp:56:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("concurs.in", "r", stdin); ^ user.cpp:57:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("concurs.out", "w", stdout); ^ user.cpp:62:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:64:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&pts[i]); ^ user.cpp:67:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^ user.cpp:77:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^