Submission #707751

#	Time	Username	Problem	Language	Result	Execution time	Memory
707751		ThMinh_	Deblo (COCI18_deblo)	C++14	90 / 90	119 ms	35508 KiB

deblo

#include<bits/stdc++.h>
#define forin(i,a,b) for(int i=a;i<=b;++i)
#define ll long long
using namespace std;
const int N = 1e5 + 10;
int n;
ll ans;
ll val[N], d[N], bit[23][N], sz[N];
vector<int> adj[N];
void dfs(int u, int p = 0) {
    sz[u] = 1;
    forin(i,0,22) bit[i][u] += ((d[u] >> i) & 1);
    for(auto v : adj[u]) if(v != p) {
        d[v] ^= d[u];
        dfs(v, u);
        forin(i,0,22) {
            ll cost = 0;
            if((val[u] >> i) & 1) {
                cost += 1ll * bit[i][u] * bit[i][v] * (1 << i);
                cost += 1ll * (sz[u] - bit[i][u]) * (sz[v] - bit[i][v]) * (1 << i);
            }
            else {
                cost += 1ll * bit[i][u] * (sz[v] - bit[i][v]) * (1 << i);
                cost += 1ll * (sz[u] - bit[i][u]) * bit[i][v] * (1 << i);
            }
            ans += cost;
        }
        forin(i,0,22) bit[i][u] += bit[i][v];
        sz[u] += sz[v];
    }
}
int32_t main () {
    cin.tie(0)->sync_with_stdio(0);
    if(fopen("Task.inp","r")) {
        freopen("Task.inp","r",stdin);
        freopen("WA.out","w",stdout);
    }
    cin>>n;
    forin(i,1,n) {
        cin>>val[i];
        d[i] = val[i];
    }
    forin(i,1,n - 1) {
        int u, v; cin>>u>>v;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    dfs(1);
    forin(i,1,n) ans += val[i];
    cout<<ans;
}

Compilation message (stderr)

deblo.cpp: In function 'int32_t main()':
deblo.cpp:35:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |         freopen("Task.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
deblo.cpp:36:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |         freopen("WA.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 90 / 90