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Submission #948935

# Submission time Handle Problem Language Result Execution time Memory
948935 2024-03-18T16:43:30 Z LucaIlie Inside information (BOI21_servers) C++17
100 / 100
 431 ms 36520 KB 
#include <bits/stdc++.h>

using namespace std;

const int MAX_N = 1.2e5;
const int MAX_Q = 1.2e5;

struct edge {
    int u, v, t;

    int other( int x ) {
        return u ^ v ^ x;
    }
};

struct query {
    char type;
    int u, v, t, ans;
};


struct FRECV {
    int f[MAX_N + 1];
    vector<int> ch;

    void init() {
        for ( int i = 0; i <= MAX_N; i++ )
            f[i] = MAX_N + MAX_Q + 1;
    }
    void clear() {
        for ( int i: ch )
            f[i] = MAX_N + MAX_Q + 1;
        ch.clear();
    }

    void update( int i, int x ) {
        f[i] = x;
        ch.push_back( i );
    }

    int qry( int x ){
        return f[x];
    }
};

struct AIB {
    int aib[MAX_N + MAX_Q + 1];
    vector<int> ch;

    void clear() {
        for ( int i: ch )
            aib[i] = 0;
        ch.clear();
    }

    void update( int i, int x ) {
        while ( i <= MAX_N + MAX_Q ) {
            aib[i] += x;
            ch.push_back( i );
            i += (i & -i);
        }
    }

    int query( int i ) {
        int s = 0;

        while ( i > 0 ) {
            s += aib[i];
            i -= (i & -i);
        }

        return s;
    }
};

edge edges[MAX_N];
query queries[MAX_Q];
vector<int> adj[MAX_N + 1], queriesQ[MAX_N + 1], queriesC[MAX_N + 1];

bool isCentroid[MAX_N + 1];
int sizee[MAX_N + 1];

void calcSizes( int u, int p ) {
    sizee[u] = 1;
    for ( int e: adj[u] ) {
        int v = edges[e].other( u );
        if ( v == p || isCentroid[v] )
            continue;
        calcSizes( v, u );
        sizee[u] += sizee[v];
    }
}

int sz, centroid;
void findCentroid( int u, int p ) {
    int maxSizee = sz - sizee[u];
    for ( int e: adj[u] ) {
        int v = edges[e].other( u );
        if ( v == p || isCentroid[v] )
            continue;
        findCentroid( v, u );
        maxSizee = max( maxSizee, sizee[v] );
    }

    if ( maxSizee <= sz / 2 )
        centroid = u;
}

vector<pair<int, int>> incc;
vector<int> decc;

void calcIncreasing( int u, int p, int t ) {
    incc.push_back( { u, t } );
    for ( int e: adj[u] ) {
        int v = edges[e].other( u ), s = edges[e].t;
        if ( v == p || isCentroid[v] || t > s )
            continue;
        calcIncreasing( v, u, s );
    }
}

void calcDecreasing( int u, int p, int t ) {
    decc.push_back( u );
    for ( int e: adj[u] ) {
        int v = edges[e].other( u ), s = edges[e].t;
        if ( v == p || isCentroid[v] || t < s )
            continue;
        calcDecreasing( v, u, s );
    }
}

FRECV timee;
AIB lowerTimee;

void decomp( int r ) {
    calcSizes( r, 0 );
    sz = sizee[r];
    findCentroid( r, 0 );
    int c = centroid;
    isCentroid[c] = true;

    sort( adj[c].begin(), adj[c].end(), []( int e, int f ) {
        return edges[e].t > edges[f].t;
    } );

    timee.clear();
    lowerTimee.clear();
    timee.update( c, 1 );
    lowerTimee.update( 1, 1 );
    for ( int e: adj[c] ) {
        int v = edges[e].other( c );
        if ( isCentroid[v] )
            continue;

        incc.clear();
        decc.clear();
        calcIncreasing( v, c, edges[e].t );
        calcDecreasing( v, c, edges[e].t );

        for ( int u: decc ) {
            for ( int q: queriesQ[u] ) {
                if ( edges[e].t <= queries[q].t && timee.qry( queries[q].u ) <= queries[q].t )
                    queries[q].ans = true;
            }
            for ( int q: queriesC[u] ) { 
                if ( edges[e].t <= queries[q].t )
                    queries[q].ans += lowerTimee.query( queries[q].t );
            }
        }

        for ( auto p: incc ) {
            int u = p.first, t = p.second;
            timee.update( u, t );
            lowerTimee.update( t, 1 );
        }
    }
    for ( int q: queriesQ[c] ) {
        if ( timee.qry( queries[q].u ) <= queries[q].t )
            queries[q].ans = true;
    }
    for ( int q: queriesC[c] )
        queries[q].ans += lowerTimee.query( queries[q].t );

    for ( int e: adj[c] ) {
        int v = edges[e].other( c );
        if ( !isCentroid[v] )
            decomp( v );
    }
}

int main() {
    int n, q;

    cin >> n >> q;

    for ( int t = 1, i = 0, j = 0; t <= n + q - 1; t++ ) {
        char ch;

        cin >> ch;
        if ( ch == 'S' ) {
            cin >> edges[i].u >> edges[i].v;
            adj[edges[i].u].push_back( i );
            adj[edges[i].v].push_back( i );
            edges[i].t = t;
            i++;
        } else {
            queries[j].type = ch;
            if ( ch == 'Q' ) {
                cin >> queries[j].u >> queries[j].v;
                queriesQ[queries[j].v].push_back( j );
            } else {
                cin >> queries[j].v;
                queriesC[queries[j].v].push_back( j );
            }
            queries[j].t = t;
            j++;
        }
    }

    timee.init();
    decomp( 1 );

    for ( int i = 0; i < q; i++ ) {
        if ( queries[i].type == 'Q' )
            cout << (queries[i].ans ? "yes\n" : "no\n");
        else
            cout << queries[i].ans << "\n";
    }

    return 0;
}

Subtask #1
2.5 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 40 ms 14164 KB Output is correct
2 Correct 57 ms 14420 KB Output is correct
3 Correct 56 ms 14560 KB Output is correct
4 Correct 58 ms 14672 KB Output is correct
5 Correct 59 ms 14808 KB Output is correct
6 Correct 66 ms 15020 KB Output is correct

Subtask #2
2.5 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 40 ms 14164 KB Output is correct
2 Correct 57 ms 14420 KB Output is correct
3 Correct 56 ms 14560 KB Output is correct
4 Correct 58 ms 14672 KB Output is correct
5 Correct 59 ms 14808 KB Output is correct
6 Correct 66 ms 15020 KB Output is correct
7 Correct 40 ms 14216 KB Output is correct
8 Correct 60 ms 15764 KB Output is correct
9 Correct 50 ms 15640 KB Output is correct
10 Correct 55 ms 15712 KB Output is correct
11 Correct 57 ms 15920 KB Output is correct
12 Correct 54 ms 16076 KB Output is correct

Subtask #3
2.5 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 46 ms 14428 KB Output is correct
2 Correct 194 ms 31352 KB Output is correct
3 Correct 186 ms 30644 KB Output is correct

Subtask #4
2.5 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 46 ms 14428 KB Output is correct
2 Correct 194 ms 31352 KB Output is correct
3 Correct 186 ms 30644 KB Output is correct
4 Correct 42 ms 14420 KB Output is correct
5 Correct 210 ms 33472 KB Output is correct
6 Correct 118 ms 30772 KB Output is correct
7 Correct 128 ms 30652 KB Output is correct

Subtask #5
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 40 ms 14220 KB Output is correct
2 Correct 327 ms 30292 KB Output is correct
3 Correct 348 ms 30196 KB Output is correct
4 Correct 268 ms 34436 KB Output is correct

Subtask #6
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 40 ms 14220 KB Output is correct
2 Correct 327 ms 30292 KB Output is correct
3 Correct 348 ms 30196 KB Output is correct
4 Correct 268 ms 34436 KB Output is correct
5 Correct 40 ms 14164 KB Output is correct
6 Correct 363 ms 33760 KB Output is correct
7 Correct 279 ms 36520 KB Output is correct
8 Correct 330 ms 33108 KB Output is correct
9 Correct 332 ms 33152 KB Output is correct

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 41 ms 14160 KB Output is correct
2 Correct 252 ms 23712 KB Output is correct
3 Correct 269 ms 20584 KB Output is correct

Subtask #8
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 41 ms 14160 KB Output is correct
2 Correct 252 ms 23712 KB Output is correct
3 Correct 269 ms 20584 KB Output is correct
4 Correct 41 ms 14160 KB Output is correct
5 Correct 274 ms 27424 KB Output is correct
6 Correct 301 ms 24216 KB Output is correct

Subtask #9
12.5 / 12.5

# Verdict Execution time Memory Grader output
1 Correct 41 ms 14160 KB Output is correct
2 Correct 357 ms 30368 KB Output is correct
3 Correct 344 ms 30188 KB Output is correct
4 Correct 275 ms 34948 KB Output is correct
5 Correct 41 ms 14256 KB Output is correct
6 Correct 272 ms 23896 KB Output is correct
7 Correct 297 ms 20704 KB Output is correct
8 Correct 283 ms 21584 KB Output is correct
9 Correct 270 ms 21328 KB Output is correct
10 Correct 336 ms 25516 KB Output is correct
11 Correct 367 ms 25144 KB Output is correct

Subtask #10
12.5 / 12.5

# Verdict Execution time Memory Grader output
1 Correct 41 ms 14160 KB Output is correct
2 Correct 357 ms 30368 KB Output is correct
3 Correct 344 ms 30188 KB Output is correct
4 Correct 275 ms 34948 KB Output is correct
5 Correct 41 ms 14256 KB Output is correct
6 Correct 272 ms 23896 KB Output is correct
7 Correct 297 ms 20704 KB Output is correct
8 Correct 283 ms 21584 KB Output is correct
9 Correct 270 ms 21328 KB Output is correct
10 Correct 336 ms 25516 KB Output is correct
11 Correct 367 ms 25144 KB Output is correct
12 Correct 40 ms 14160 KB Output is correct
13 Correct 352 ms 33944 KB Output is correct
14 Correct 280 ms 36352 KB Output is correct
15 Correct 318 ms 33164 KB Output is correct
16 Correct 326 ms 33224 KB Output is correct
17 Correct 40 ms 15216 KB Output is correct
18 Correct 264 ms 27232 KB Output is correct
19 Correct 262 ms 24368 KB Output is correct
20 Correct 320 ms 24916 KB Output is correct
21 Correct 271 ms 25072 KB Output is correct
22 Correct 327 ms 27748 KB Output is correct
23 Correct 431 ms 30184 KB Output is correct
24 Correct 380 ms 30084 KB Output is correct

Subtask #11
17.5 / 17.5

# Verdict Execution time Memory Grader output
1 Correct 40 ms 14160 KB Output is correct
2 Correct 57 ms 14416 KB Output is correct
3 Correct 56 ms 14416 KB Output is correct
4 Correct 58 ms 14676 KB Output is correct
5 Correct 74 ms 14676 KB Output is correct
6 Correct 56 ms 14836 KB Output is correct
7 Correct 41 ms 14400 KB Output is correct
8 Correct 176 ms 31204 KB Output is correct
9 Correct 182 ms 30656 KB Output is correct
10 Correct 40 ms 14164 KB Output is correct
11 Correct 321 ms 30280 KB Output is correct
12 Correct 363 ms 30292 KB Output is correct
13 Correct 290 ms 36228 KB Output is correct
14 Correct 41 ms 14164 KB Output is correct
15 Correct 279 ms 23756 KB Output is correct
16 Correct 340 ms 20632 KB Output is correct
17 Correct 274 ms 21556 KB Output is correct
18 Correct 325 ms 21200 KB Output is correct
19 Correct 367 ms 25388 KB Output is correct
20 Correct 334 ms 24888 KB Output is correct
21 Correct 216 ms 27672 KB Output is correct
22 Correct 255 ms 27072 KB Output is correct
23 Correct 233 ms 21748 KB Output is correct
24 Correct 227 ms 21532 KB Output is correct
25 Correct 347 ms 31076 KB Output is correct
26 Correct 282 ms 20176 KB Output is correct
27 Correct 277 ms 19924 KB Output is correct

Subtask #12
17.5 / 17.5

# Verdict Execution time Memory Grader output
1 Correct 40 ms 14160 KB Output is correct
2 Correct 57 ms 14416 KB Output is correct
3 Correct 56 ms 14416 KB Output is correct
4 Correct 58 ms 14676 KB Output is correct
5 Correct 74 ms 14676 KB Output is correct
6 Correct 56 ms 14836 KB Output is correct
7 Correct 41 ms 14400 KB Output is correct
8 Correct 176 ms 31204 KB Output is correct
9 Correct 182 ms 30656 KB Output is correct
10 Correct 40 ms 14164 KB Output is correct
11 Correct 321 ms 30280 KB Output is correct
12 Correct 363 ms 30292 KB Output is correct
13 Correct 290 ms 36228 KB Output is correct
14 Correct 41 ms 14164 KB Output is correct
15 Correct 279 ms 23756 KB Output is correct
16 Correct 340 ms 20632 KB Output is correct
17 Correct 274 ms 21556 KB Output is correct
18 Correct 325 ms 21200 KB Output is correct
19 Correct 367 ms 25388 KB Output is correct
20 Correct 334 ms 24888 KB Output is correct
21 Correct 216 ms 27672 KB Output is correct
22 Correct 255 ms 27072 KB Output is correct
23 Correct 233 ms 21748 KB Output is correct
24 Correct 227 ms 21532 KB Output is correct
25 Correct 347 ms 31076 KB Output is correct
26 Correct 282 ms 20176 KB Output is correct
27 Correct 277 ms 19924 KB Output is correct
28 Correct 44 ms 14160 KB Output is correct
29 Correct 55 ms 15696 KB Output is correct
30 Correct 60 ms 15732 KB Output is correct
31 Correct 57 ms 15724 KB Output is correct
32 Correct 57 ms 15956 KB Output is correct
33 Correct 54 ms 15856 KB Output is correct
34 Correct 40 ms 15188 KB Output is correct
35 Correct 185 ms 34436 KB Output is correct
36 Correct 123 ms 31328 KB Output is correct
37 Correct 131 ms 30612 KB Output is correct
38 Correct 40 ms 15220 KB Output is correct
39 Correct 329 ms 33876 KB Output is correct
40 Correct 284 ms 36480 KB Output is correct
41 Correct 312 ms 33108 KB Output is correct
42 Correct 325 ms 33152 KB Output is correct
43 Correct 48 ms 15096 KB Output is correct
44 Correct 276 ms 27436 KB Output is correct
45 Correct 263 ms 24436 KB Output is correct
46 Correct 298 ms 24912 KB Output is correct
47 Correct 279 ms 24896 KB Output is correct
48 Correct 325 ms 27872 KB Output is correct
49 Correct 430 ms 30052 KB Output is correct
50 Correct 398 ms 30088 KB Output is correct
51 Correct 166 ms 33908 KB Output is correct
52 Correct 146 ms 32592 KB Output is correct
53 Correct 139 ms 32004 KB Output is correct
54 Correct 154 ms 33140 KB Output is correct
55 Correct 147 ms 28728 KB Output is correct
56 Correct 214 ms 24048 KB Output is correct
57 Correct 279 ms 31552 KB Output is correct
58 Correct 351 ms 24492 KB Output is correct
59 Correct 277 ms 23476 KB Output is correct