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Submission #298872

# Submission time Handle Problem Language Result Execution time Memory
298872 2020-09-14T08:52:53 Z muhammad_hokimiyon Highway Tolls (IOI18_highway) C++14
100 / 100
 332 ms 23788 KB 
#include "highway.h"
#include <bits/stdc++.h>

using namespace std;

#define fi first
#define se second
#define ll long long
#define dl double long

const int maxn = 200100;

int m;
ll dist;
bool used[maxn];
int h[maxn];
int pa[maxn];
vector < int > nnj,f;
vector < pair < int , int > > v[maxn],g[maxn];

void dfs( int x , int p , int id )
{
    h[x] = h[p] + 1;
    f.push_back(x);
    pa[x] = id;
    for(  auto y : g[x] ){
        if( y.fi != p ){
            dfs( y.fi , x , y.se );
        }
    }
}

int solve( int x )
{
    f.clear();
    h[x] = 0;
    dfs( x , x , -1 );
    vector < pair < int , int > > v;
    for( int i = 0; i < (int)f.size(); i++ ){
        v.push_back({ h[f[i]] , f[i] });
    }
    sort( v.rbegin() , v.rend() );
    int l = 0 , r = (int)v.size() - 1;
    int res = (int)v.size() - 1;
    while( l <= r ){
        int mi = (l + r) / 2;
        vector < int > w(m , 0);
        for( auto y : nnj ){
            w[y] = 1;
        }
        for( int i = 0; i <= mi; i++ ){
            if( pa[v[i].se] != -1 ){
                w[pa[v[i].se]] = 1;
            }
        }
        ll di = ask( w );
        if( di > dist ){
            res = min( res , mi );
            r = mi - 1;
        }else l = mi + 1;
    }
    return v[res].se;
}

void bfs( int x , int y )
{
    vector < int > d(maxn , 1e9);
    vector < int > p(maxn , -1);
    d[x] = d[y] = 0;
    queue < int > q;
    q.push(x);
    q.push(y);
    while( !q.empty() ){
        int x = q.front();
        q.pop();
        for( auto y : v[x] ){
            if( d[y.fi] == 1e9 ){
                d[y.fi] = d[x] + 1;
                used[y.se] = true;
                g[x].push_back(y);
                g[y.fi].push_back({ x , y.se });
                q.push(y.fi);
            }
        }
    }
}

void find_pair(int N, vector<int> U, vector<int> V, int A, int B)
{
    m = (int)U.size();
    vector < int > a,b;
    vector < int > w(m , 0);
    dist = ask(w);
    for( int i = 0; i < m; i++ ){
        int x = U[i] , y = V[i];
        v[x].push_back({y , i});
        v[y].push_back({x , i});
    }
    int l = 0 , r = m - 1;
    while( l < r ){
        int mid = (l + r) / 2;
        vector < int > w(m , 0);
        for( int j = 0; j <= mid; j++ )w[j] = 1;
        ll x = ask( w );
        if( x == dist )l = mid + 1;
        else r = mid;
    }
    bfs( U[l] , V[l] );
    used[l] = true;
    for( int i = 0; i < m; i++ ){
        if( used[i] )continue;
        nnj.push_back(i);
    }
    int ans1 = solve( U[l] );
    int ans2 = solve( V[l] );
    answer(ans1 , ans2);
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 11264 KB Output is correct
2 Correct 8 ms 11264 KB Output is correct
3 Correct 9 ms 11264 KB Output is correct
4 Correct 10 ms 11264 KB Output is correct
5 Correct 8 ms 11264 KB Output is correct
6 Correct 9 ms 11264 KB Output is correct
7 Correct 9 ms 11316 KB Output is correct
8 Correct 8 ms 11264 KB Output is correct
9 Correct 8 ms 11324 KB Output is correct
10 Correct 8 ms 11264 KB Output is correct
11 Correct 10 ms 11264 KB Output is correct
12 Correct 8 ms 11264 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 11392 KB Output is correct
2 Correct 24 ms 12288 KB Output is correct
3 Correct 208 ms 21304 KB Output is correct
4 Correct 208 ms 21164 KB Output is correct
5 Correct 204 ms 21292 KB Output is correct
6 Correct 199 ms 21228 KB Output is correct
7 Correct 217 ms 21308 KB Output is correct
8 Correct 211 ms 21184 KB Output is correct
9 Correct 202 ms 21196 KB Output is correct
10 Correct 207 ms 21228 KB Output is correct
11 Correct 244 ms 20144 KB Output is correct
12 Correct 221 ms 21052 KB Output is correct
13 Correct 217 ms 21152 KB Output is correct
14 Correct 221 ms 20852 KB Output is correct

Subtask #3
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 12152 KB Output is correct
2 Correct 38 ms 12920 KB Output is correct
3 Correct 56 ms 14496 KB Output is correct
4 Correct 146 ms 22000 KB Output is correct
5 Correct 154 ms 21912 KB Output is correct
6 Correct 152 ms 23040 KB Output is correct
7 Correct 153 ms 23760 KB Output is correct
8 Correct 156 ms 22332 KB Output is correct
9 Correct 153 ms 22624 KB Output is correct

Subtask #4
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 11392 KB Output is correct
2 Correct 26 ms 12288 KB Output is correct
3 Correct 154 ms 19264 KB Output is correct
4 Correct 211 ms 21180 KB Output is correct
5 Correct 205 ms 21188 KB Output is correct
6 Correct 202 ms 21176 KB Output is correct
7 Correct 205 ms 21204 KB Output is correct
8 Correct 199 ms 21176 KB Output is correct
9 Correct 222 ms 21104 KB Output is correct
10 Correct 205 ms 21224 KB Output is correct
11 Correct 218 ms 20684 KB Output is correct
12 Correct 211 ms 21100 KB Output is correct
13 Correct 224 ms 20816 KB Output is correct
14 Correct 231 ms 20408 KB Output is correct
15 Correct 204 ms 21208 KB Output is correct
16 Correct 198 ms 21196 KB Output is correct
17 Correct 231 ms 20684 KB Output is correct
18 Correct 230 ms 21040 KB Output is correct
19 Correct 206 ms 21200 KB Output is correct
20 Correct 223 ms 21328 KB Output is correct
21 Correct 181 ms 21884 KB Output is correct
22 Correct 164 ms 21892 KB Output is correct
23 Correct 180 ms 21160 KB Output is correct
24 Correct 178 ms 21248 KB Output is correct
25 Correct 194 ms 23788 KB Output is correct

Subtask #5
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 29 ms 12288 KB Output is correct
2 Correct 28 ms 12288 KB Output is correct
3 Correct 238 ms 21488 KB Output is correct
4 Correct 249 ms 21744 KB Output is correct
5 Correct 293 ms 22864 KB Output is correct
6 Correct 291 ms 22520 KB Output is correct
7 Correct 295 ms 22476 KB Output is correct
8 Correct 312 ms 22472 KB Output is correct
9 Correct 195 ms 18476 KB Output is correct
10 Correct 197 ms 18816 KB Output is correct
11 Correct 219 ms 19928 KB Output is correct
12 Correct 270 ms 21396 KB Output is correct
13 Correct 288 ms 21720 KB Output is correct
14 Correct 318 ms 22108 KB Output is correct
15 Correct 283 ms 22584 KB Output is correct
16 Correct 246 ms 19628 KB Output is correct
17 Correct 176 ms 22156 KB Output is correct
18 Correct 177 ms 22156 KB Output is correct
19 Correct 177 ms 22028 KB Output is correct
20 Correct 182 ms 22224 KB Output is correct
21 Correct 323 ms 23044 KB Output is correct

Subtask #6
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 27 ms 12288 KB Output is correct
2 Correct 29 ms 12288 KB Output is correct
3 Correct 254 ms 20972 KB Output is correct
4 Correct 253 ms 21240 KB Output is correct
5 Correct 260 ms 21564 KB Output is correct
6 Correct 292 ms 22688 KB Output is correct
7 Correct 228 ms 21604 KB Output is correct
8 Correct 244 ms 21704 KB Output is correct
9 Correct 253 ms 21620 KB Output is correct
10 Correct 311 ms 22388 KB Output is correct
11 Correct 293 ms 22440 KB Output is correct
12 Correct 290 ms 22520 KB Output is correct
13 Correct 215 ms 19868 KB Output is correct
14 Correct 210 ms 18796 KB Output is correct
15 Correct 198 ms 19888 KB Output is correct
16 Correct 190 ms 18676 KB Output is correct
17 Correct 205 ms 19872 KB Output is correct
18 Correct 196 ms 18916 KB Output is correct
19 Correct 280 ms 21392 KB Output is correct
20 Correct 290 ms 21960 KB Output is correct
21 Correct 319 ms 22120 KB Output is correct
22 Correct 306 ms 22080 KB Output is correct
23 Correct 312 ms 22312 KB Output is correct
24 Correct 302 ms 22204 KB Output is correct
25 Correct 285 ms 22388 KB Output is correct
26 Correct 306 ms 22484 KB Output is correct
27 Correct 178 ms 22084 KB Output is correct
28 Correct 185 ms 21960 KB Output is correct
29 Correct 179 ms 22540 KB Output is correct
30 Correct 176 ms 22152 KB Output is correct
31 Correct 176 ms 22132 KB Output is correct
32 Correct 171 ms 22032 KB Output is correct
33 Correct 189 ms 22424 KB Output is correct
34 Correct 178 ms 22116 KB Output is correct
35 Correct 174 ms 22008 KB Output is correct
36 Correct 175 ms 21860 KB Output is correct
37 Correct 175 ms 22484 KB Output is correct
38 Correct 170 ms 22284 KB Output is correct
39 Correct 304 ms 23360 KB Output is correct
40 Correct 303 ms 23216 KB Output is correct
41 Correct 281 ms 22992 KB Output is correct
42 Correct 332 ms 22616 KB Output is correct