제출 #90281

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
90281		psmao	Deblo (COCI18_deblo)	C++14	90 / 90	154 ms	37800 KiB

deblo

#include <bits/stdc++.h>
using namespace std;
#define fo(i,s,t) for(int i = s; i <= t; ++ i)
#define fd(i,s,t) for(int i = s; i >= t; -- i)
#define sf scanf
#define pf printf
typedef long long ll;
const int maxn = 100050;
int n, a[maxn], g[maxn][30][2];
ll ret[30][2], ans, sz[30][2];
vector<int> adj[maxn];
void dfs(int u, int fa=0)
{
	for(auto p : adj[u]) if(p != fa) dfs(p, u);
	fo(j,0,29) ret[j][0] = ret[j][1] = sz[j][0] = sz[j][1] = 0;
	fo(j,0,29) if(a[u]&(1<<j)) g[u][j][1] = 1; else g[u][j][0] = 1;
	for(auto p : adj[u]) if(p != fa)
	{
		fo(j,0,29) 
		{
			if(a[u]&(1<<j)) g[u][j][0] += g[p][j][1], g[u][j][1] += g[p][j][0];
			else g[u][j][0] += g[p][j][0], g[u][j][1] += g[p][j][1];
			ret[j][0] += sz[j][0] * g[p][j][0] + sz[j][1] * g[p][j][1];
			ret[j][1] += sz[j][1] * g[p][j][0] + sz[j][0] * g[p][j][1];
			sz[j][0] += g[p][j][0]; sz[j][1] += g[p][j][1];
		}
	}
	fo(i,0,29) ret[i][0] += sz[i][0], ret[i][1] += sz[i][1];
	fo(i,0,29) if(a[u]&(1<<i)) ans += (1<<i)*ret[i][0]; else ans += (1<<i)*ret[i][1];
	ans += a[u];
}
int main()
{
	sf("%d",&n);
	fo(i,1,n) sf("%d",&a[i]);
	fo(i,2,n) {int u, v; sf("%d%d",&u,&v); adj[u].emplace_back(v); adj[v].emplace_back(u);}
	dfs(1);
	cout << ans << endl;
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

deblo.cpp: In function 'int main()':
deblo.cpp:34:4: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  sf("%d",&n);
    ^
deblo.cpp:35:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  fo(i,1,n) sf("%d",&a[i]);
              ^
deblo.cpp:36:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  fo(i,2,n) {int u, v; sf("%d%d",&u,&v); adj[u].emplace_back(v); adj[v].emplace_back(u);}
                         ^

• Subtask 1: 90 / 90