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답안 #274467

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
274467 2020-08-19T12:06:55 Z evpipis Regions (IOI09_regions) C++11
60 / 100
 8000 ms 131076 KB 
#include <bits/stdc++.h>
using namespace std;

#define pb push_back

const int k = 100, len = 2e5+5;
int cnt_st[len], cnt_en[len], order[len], pos[len], cnt;
vector<int> vec[len], adj[len], store_big, buck[len];
int par[len], reg[len], big[len], n, r, q;
int prec[len/k][len/k];

struct node{
    int val;
    node *lef, *rig;

    node(int v = 0, node *l = NULL, node *r = NULL){
        val = v;
        lef = l;
        rig = r;
    }
};

typedef node *pnode;
pnode null, root[len];

pnode update(pnode t, int l, int r, int i){
    if (l == r)
        return new node(t->val+1, null, null);

    int mid = (l+r)/2;
    if (i <= mid)
        return new node(t->val+1, update(t->lef, l, mid, i), t->rig);
    else
        return new node(t->val+1, t->lef, update(t->rig, mid+1, r, i));
}

int query(pnode t, int l, int r, int i){
    while (l < r){
        int mid = (l+r)/2;
        if (i <= mid)
            t = t->lef, r = mid;
        else
            t = t->rig, l = mid+1;
    }

    return t->val;
}

void fix(int u){
    cnt_st[u] = ++cnt;
    order[cnt] = u;
    root[u] = update(root[par[u]], 1, r, reg[u]);

    for (auto v: adj[u])
        fix(v);

    cnt_en[u] = cnt;
}

int bs(int myr, int l, int r){
    return upper_bound(vec[myr].begin(), vec[myr].end(), r) - lower_bound(vec[myr].begin(), vec[myr].end(), l);
}

int main(){
    scanf("%d %d %d", &n, &r, &q);
    scanf("%d", &reg[1]);
    buck[reg[1]].pb(1);
    for (int i = 2; i <= n; i++){
        scanf("%d %d", &par[i], &reg[i]);
        buck[reg[i]].pb(i);
        adj[par[i]].pb(i);
    }

    for (int i = 1; i <= r; i++)
        big[i] = (buck[i].size() > k);

    /// make persistent segment tree
    null = new node();
    null->lef = null->rig = null;
    root[0] = null;
    fix(1);

    /// fix vec[]
    for (int i = 1; i <= n; i++)
        vec[reg[order[i]]].pb(i);

    /// compute prec[]
    for (int i = 1; i <= r; i++)
        if (big[i])
            pos[i] = store_big.size(), store_big.pb(i);

    for (int u = 1; u <= n; u++){
        if (!big[reg[u]]) continue;

        int r1 = reg[u];
        for (auto r2: store_big)
            prec[pos[r1]][pos[r2]] += bs(r2, cnt_st[u], cnt_en[u]);
    }

    // answer queries
    while (q--){
        int r1, r2;
        scanf("%d %d", &r1, &r2);

        if (!big[r1]){
            int ans = 0;
            for (auto u: buck[r1])
                ans += bs(r2, cnt_st[u], cnt_en[u]);
            printf("%d\n", ans), fflush(stdout);
        }
        else if (!big[r2]){
            int ans = 0;
            for (auto u: buck[r2])
                ans += query(root[u], 1, r, r1);
            printf("%d\n", ans), fflush(stdout);
        }
        else{
            printf("%d\n", prec[pos[r1]][pos[r2]]), fflush(stdout);
        }
    }
    return 0;
}

Compilation message

regions.cpp: In function 'int main()':
regions.cpp:65:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   65 |     scanf("%d %d %d", &n, &r, &q);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
regions.cpp:66:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   66 |     scanf("%d", &reg[1]);
      |     ~~~~~^~~~~~~~~~~~~~~
regions.cpp:69:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   69 |         scanf("%d %d", &par[i], &reg[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
regions.cpp:103:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  103 |         scanf("%d %d", &r1, &r2);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 14464 KB Output is correct
2 Correct 11 ms 14464 KB Output is correct
3 Correct 12 ms 14464 KB Output is correct
4 Correct 14 ms 14464 KB Output is correct
5 Correct 19 ms 14592 KB Output is correct
6 Correct 27 ms 14720 KB Output is correct
7 Correct 40 ms 14976 KB Output is correct
8 Correct 40 ms 15104 KB Output is correct
9 Correct 60 ms 16384 KB Output is correct
10 Correct 97 ms 18176 KB Output is correct
11 Correct 140 ms 19840 KB Output is correct
12 Correct 126 ms 22144 KB Output is correct
13 Correct 229 ms 22912 KB Output is correct
14 Correct 505 ms 25720 KB Output is correct
15 Correct 599 ms 30996 KB Output is correct

Subtask #2
45.0 / 85.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1718 ms 41564 KB Output is correct
2 Correct 1861 ms 42192 KB Output is correct
3 Correct 2383 ms 48488 KB Output is correct
4 Correct 408 ms 29176 KB Output is correct
5 Correct 424 ms 33528 KB Output is correct
6 Correct 692 ms 40824 KB Output is correct
7 Correct 1610 ms 51380 KB Output is correct
8 Correct 2366 ms 70352 KB Output is correct
9 Correct 7329 ms 99940 KB Output is correct
10 Execution timed out 8035 ms 117752 KB Time limit exceeded
11 Execution timed out 8019 ms 129200 KB Time limit exceeded
12 Execution timed out 8032 ms 121116 KB Time limit exceeded
13 Execution timed out 8053 ms 121104 KB Time limit exceeded
14 Execution timed out 8020 ms 127328 KB Time limit exceeded
15 Runtime error 292 ms 131076 KB Execution killed with signal 9 (could be triggered by violating memory limits)
16 Runtime error 269 ms 131076 KB Execution killed with signal 9 (could be triggered by violating memory limits)
17 Runtime error 281 ms 131076 KB Execution killed with signal 9 (could be triggered by violating memory limits)