Submission #764918

#	Time	Username	Problem	Language	Result	Execution time	Memory
764918		vjudge1	Roadside Advertisements (NOI17_roadsideadverts)	C++17	0 / 100	2 ms	980 KiB

roadsideadverts

#include <bits/stdc++.h>
#define ibase ios::sync_with_stdio(false); cin.tie(0);  cout.tie(0)
#define pb push_back
#define ff first
#define int long long
#define ss second
using namespace std;
const int N = 1e3 + 3;
const int MOD = 1e9 + 7;
int a[N], ans[N], pos[N], cnt = 1;
vector < pair < int, int > > g[N];
void dfs(int v){
    cnt++;
    for(auto to : g[v]){
        a[cnt] = to.ss;
        pos[to.ff] = cnt;
        dfs(to.ff);
    }
}
void solve(){
    int n, sum = 0;
    cin >> n;
    set < int > s;
    for(int i=1; i<n; i++){
        int x, y, cost;
        cin >> x >> y >> cost;
        s.insert(x);
        s.insert(y);
        sum += cost;
        g[x].pb(make_pair(y, cost));
    }
    int z;
    bool ok = 0;
    for(int i=0; i<=n; i++){
        if(g[i].size() == 0) continue;
        if(g[i].size() == 1){
            if(ok == 0){
                ok = 1;
                z = i;
                pos[i] = 1;
            }
            else{
                pos[i] = s.size();
            }
        }
    }
    dfs(z);
    for(int i=1; i<=n; i++){
        ans[i] = ans[i - 1] + a[i];
    }
    int q;
    cin >> q;
    while(q--){
        int a, b, c, d, e;
        cin >> a >> b >> c >> d >> e;
        int l, r;
        l = min({pos[a], pos[b], pos[c], pos[d], pos[e]});
        r = max({pos[a], pos[b], pos[c], pos[d], pos[e]});
        cout << ans[r] - ans[l - 1] << endl;
    }
}
signed main() {
    ibase;
    int t = 1;
    //freopen("floor4.in", "r", stdin);
    //freopen("floor4.out", "w", stdout);
    //cin >> t;
    while (t--) {
        solve();
    }
}

Compilation message (stderr)

roadsideadverts.cpp: In function 'void solve()':
roadsideadverts.cpp:47:8: warning: 'z' may be used uninitialized in this function [-Wmaybe-uninitialized]
   47 |     dfs(z);
      |     ~~~^~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 23
• Subtask 3: 0 / 40
• Subtask 4: 0 / 30