Submission #1079109

#	Time	Username	Problem	Language	Result	Execution time	Memory
1079109		hasan2006	Closing Time (IOI23_closing)	C++17	0 / 100	55 ms	10064 KiB

closing

#include "closing.h"
#include <bits/stdc++.h>
using namespace std;

#define TL ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define rall(s) s.rbegin(),s.rend()
#define all(s) s.begin(),s.end()
#define pb push_back
#define se second
#define fi first
#define ll long long
#define ld long double
#define YES cout<<"YES\n"
#define Yes cout<<"Yes\n"
#define yes cout<<"yes\n"
#define NO cout<<"NO\n"
#define No cout<<"No\n"
#define no cout<<"no\n"


const int N = 3e3 + 9 , mod = 1e9 + 7;
ll a[N], b[N] ,  c[N] , ind[N] , d[N][2]  ;

vector<pair<int,int>>v[N];
void dfs(int n , int x , int p = 0) {
    for(auto to : v[n])
        if(to.fi != p)
            d[to.fi][x] = d[n][x] + to.se , dfs(to.fi , x , n);
}
int n;
ll get(int x , int y) {
    if(x < 1 || x > n)
        return 1e18 + 5;
    else
        return d[ind[x]][0];
}

void Clear(int n ) {
    for(int i = 0; i <= n + 4; i++)
        v[i].clear() , d[i][0] = d[i][1] = 0, c[i] = 0, ind[i] = 0;
}

int max_score(int n, int x, int y, long long k, std::vector<int> U,std::vector<int> V, std::vector<int> W) {
    ll i , j , l  , r,  s = 0 , f , m , ans= 0 , mxz = 0;
    x++ , y++;
    ::n = n;
    for(i = 0; i < n - 1; i++) {
        l = V[i] + 1, r = U[i] + 1;
        v[l].pb({r , W[i]});
        v[r].pb({l , W[i]});
    }
    for(i = 1; i <= n; i++)
        if(v[i].size() == 1)
            f = i;
    l = 0;
    for(i = 1; i <= n; i++){
        c[f] = i;
        ind[i] = f;
        for(auto to : v[f])
            if(to.fi != l) {
                l = f , f = to.fi ;
                break;
            }
    }
    if(c[x] > c[y])
        swap(x , y);
    dfs(x , 0);
    dfs(y , 1);
    f = 0;
    for(i = c[x]; i <= n; i++) {
        l = ind[i];
        f += d[l][0];
        s = f;
        ll l1 = c[x] , l2 = max(i , c[y]);
        ll sum = i - c[x] + 1;
        if(i > c[y])
            sum += (i - c[y]);
        while(true) {
            if(get(l1 - 1 , 0) < get(l2 + 1 , 1) && get(l1 - 1, 0) + s <= k) {
                s += get(l1 - 1, 0) ,sum++ ,  l1--;
            }else if(get(l2 + 1, 1) + s <= k){
                s += get(l2 + 1, 1), sum++ , l2++;
            }else {
                break;
            }
        }
        if(s <= k)
            ans = max(ans , sum);
        else
            break;
        for(j = c[y]; j >= 1; j--) {
            l = ind[j];
            if(j < c[x]) {
                if(j >= l1)
                    sum -- , s -= d[l][0];
                s += d[l][1] , sum += 2;
            }else {
                if(i >= j)
                    s -= d[l][0] , s += max(d[l][1] , d[l][0]);
                else
                    s += d[l][1];
                sum++;
            }
            while(s > k) {
                if(l2 <= max(i , c[y]) || l1 >= min(j , c[x]))
                    break;
                if((l2 > max(i, c[y]) && l1 < min(j , c[x]) && get(l2 , 1) > get(l1 , 0)) || (l1 >= min(j , c[x]))){
                    s -= get(l2 , 1) , l2-- , sum--;
                }else {
                    s -= get(l1 , 0) ,l1++ , sum--;
                }
            }
            if(s > k)
                break;
            ans = max(ans , sum);
        }
    }
    Clear(n);
    return ans;
}

Compilation message (stderr)

closing.cpp: In function 'int max_score(int, int, int, long long int, std::vector<int>, std::vector<int>, std::vector<int>)':
closing.cpp:44:37: warning: unused variable 'm' [-Wunused-variable]
   44 |     ll i , j , l  , r,  s = 0 , f , m , ans= 0 , mxz = 0;
      |                                     ^
closing.cpp:44:50: warning: unused variable 'mxz' [-Wunused-variable]
   44 |     ll i , j , l  , r,  s = 0 , f , m , ans= 0 , mxz = 0;
      |                                                  ^~~
closing.cpp:44:33: warning: 'f' may be used uninitialized in this function [-Wmaybe-uninitialized]
   44 |     ll i , j , l  , r,  s = 0 , f , m , ans= 0 , mxz = 0;
      |                                 ^

• Subtask 0: 0 / 0
• Subtask 1: 0 / 8
• Subtask 2: 0 / 9
• Subtask 3: 0 / 12
• Subtask 4: 0 / 14
• Subtask 5: 0 / 9
• Subtask 6: 0 / 11
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 17