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답안 #523449

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
523449 2022-02-07T16:27:46 Z Vladth11 Regions (IOI09_regions) C++14
35 / 100
 3619 ms 131076 KB 
#include <bits/stdc++.h>
#define debug(x) cerr << #x << " " << x << "\n"
#define debugs(x) cerr << #x << " " << x << " "

using namespace std;
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <long double, pii> muchie;

const int NMAX = 200001;
const int VMAX = 21;
const int INF = (1LL << 60);
const int MOD = 1000000007;
const int BLOCK = 447;
const int base = 31;
const int nr_of_bits = 21;
const int MMAX = NMAX / BLOCK + 5;

vector <int> v[NMAX], vertices[NMAX];
vector <pii> lista[NMAX];
int stamp;
int n, R, Q;
ll sol[MMAX][25001];
ll precalc[25001][MMAX];
int region[NMAX];
int bigR[NMAX];
int smallR[NMAX];
int bigIdx[NMAX];
int smallIdx[NMAX];
int cati[NMAX];
int stiva[NMAX];
int vf;
int countAbove[MMAX];
int timestamp;
pii timp[NMAX];
int preorder[NMAX + 1];

void DFS(int node, int p) {
    stamp++;
    timp[node].first = ++timestamp;
    lista[region[node]].push_back({node, stamp});
    if(bigIdx[region[node]] != 0) {
        countAbove[bigIdx[region[node]]]++;
    }
    for(int i = 1; i <= MMAX; i++) {
        sol[i][region[node]] += 1LL * countAbove[i];
    }
    for(auto x : v[node]) {
        if(x == p)
            continue;
        DFS(x, node);
    }
    if(bigIdx[region[node]] != 0) {
        countAbove[bigIdx[region[node]]]--;
    }
    stamp++;
    timp[node].second = timestamp;
    lista[region[node]].push_back({node, stamp});
}

int main() {
    int i;
    cin >> n >> R >> Q;
    cin >> region[1];
    vertices[region[1]].push_back(1);
    cati[region[1]]++;
    for(i = 2; i <= n; i++) {
        int p;
        cin >> p >> region[i];
        v[p].push_back(i);
        v[i].push_back(p);
        vertices[region[i]].push_back(i);
        cati[region[i]]++;
    }
    int cc = 0, sc = 0;
    for(i = 1; i <= R; i++) {
        if(cati[i] >= BLOCK) {
            bigR[++cc] = i;
            bigIdx[i] = cc;
        } else {
            smallR[++sc] = i;
            smallIdx[i] = sc;
        }
    }
    DFS(1, 0);
    for(int i = 1; i <= R; i++) {
        if(bigIdx[i] == 0) continue;
        for(auto x : vertices[i]) {
            preorder[timp[x].first] = 1;
            preorder[timp[x].second + 1] = -1;
        }
        for(int j = 1; j <= n; j++) {
            preorder[j] += preorder[j - 1];
        }
        for(int j = 1; j <= sc; j++) {
            for(auto x : vertices[smallR[j]])
                precalc[j][bigIdx[i]] += 1LL * (preorder[timp[x].second] - preorder[timp[x].first - 1]);
        }
        for(int j = 1; j <= n; j++)
            preorder[j] = 0;
    }
    while(Q--) {
        int a, b;
        cin >> a >> b;
        if(bigIdx[a] != 0) { /// Aia de sus mare
            cout << sol[bigIdx[a]][b] << "\n";
        } else if(bigIdx[b] != 0) { /// Aia de jos mare si aia de sus mica
            cout << precalc[smallIdx[a]][bigIdx[b]] << "\n";
        } else { /// Ambele mici
            int i = 0;
            int j = 0;
            int deschise = 0;
            vf = 0;
            int rez = 0;
            while(i < lista[a].size() && j < lista[b].size()) {
                pii x = lista[a][i];
                pii y = lista[b][j];
                if(x.second < y.second) {
                    if(stiva[vf] == x.first) {
                        vf--;
                        deschise--;
                    } else {
                        stiva[++vf] = x.first;
                        deschise++;
                    }
                    i++;
                } else {
                    if(stiva[vf] == y.first) {
                        vf--;
                    } else {
                        rez += deschise;
                        stiva[++vf] = y.first;
                    }
                    j++;
                }
            }
            cout << rez;
        }
        cout << endl;
    }
    return 0;
}

Compilation message

regions.cpp:12:22: warning: overflow in conversion from 'long long int' to 'int' changes value from '1152921504606846976' to '0' [-Woverflow]
   12 | const int INF = (1LL << 60);
      |                 ~~~~~^~~~~~
regions.cpp: In function 'int main()':
regions.cpp:115:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  115 |             while(i < lista[a].size() && j < lista[b].size()) {
      |                   ~~^~~~~~~~~~~~~~~~~
regions.cpp:115:44: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  115 |             while(i < lista[a].size() && j < lista[b].size()) {
      |                                          ~~^~~~~~~~~~~~~~~~~
regions.cpp: In function 'void DFS(int, int)':
regions.cpp:46:30: warning: iteration 451 invokes undefined behavior [-Waggressive-loop-optimizations]
   46 |         sol[i][region[node]] += 1LL * countAbove[i];
      |         ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
regions.cpp:45:22: note: within this loop
   45 |     for(int i = 1; i <= MMAX; i++) {
      |                    ~~^~~~~~~

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 16328 KB Output is correct
2 Correct 9 ms 16328 KB Output is correct
3 Correct 11 ms 16456 KB Output is correct
4 Correct 14 ms 16456 KB Output is correct
5 Correct 12 ms 16584 KB Output is correct
6 Correct 27 ms 17352 KB Output is correct
7 Correct 34 ms 16968 KB Output is correct
8 Correct 26 ms 17224 KB Output is correct
9 Correct 58 ms 18152 KB Output is correct
10 Correct 110 ms 18652 KB Output is correct
11 Correct 135 ms 18396 KB Output is correct
12 Correct 175 ms 19800 KB Output is correct
13 Correct 192 ms 19468 KB Output is correct
14 Correct 278 ms 19516 KB Output is correct
15 Correct 311 ms 23468 KB Output is correct

Subtask #2
20.0 / 85.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1174 ms 24412 KB Output isn't correct
2 Incorrect 1127 ms 24092 KB Output isn't correct
3 Incorrect 1932 ms 27416 KB Output isn't correct
4 Correct 451 ms 32984 KB Output is correct
5 Correct 584 ms 38676 KB Output is correct
6 Incorrect 914 ms 67572 KB Output isn't correct
7 Incorrect 1464 ms 92920 KB Output isn't correct
8 Incorrect 1474 ms 99588 KB Output isn't correct
9 Correct 2626 ms 82700 KB Output is correct
10 Runtime error 1123 ms 131076 KB Execution killed with signal 9
11 Correct 3619 ms 118596 KB Output is correct
12 Runtime error 1117 ms 131076 KB Execution killed with signal 9
13 Runtime error 1067 ms 131076 KB Execution killed with signal 9
14 Runtime error 1177 ms 131076 KB Execution killed with signal 9
15 Runtime error 1249 ms 131076 KB Execution killed with signal 9
16 Runtime error 1134 ms 131076 KB Execution killed with signal 9
17 Runtime error 1139 ms 131076 KB Execution killed with signal 9