Submission #826174

#	Time	Username	Problem	Language	Result	Execution time	Memory
826174		PixelCat	Digital Circuit (IOI22_circuit)	C++17	4 / 100	779 ms	11656 KiB

circuit

#include "circuit.h"

#ifdef NYAOWO
#include "stub.cpp"
#endif

#include <bits/stdc++.h>
#define For(i, a, b) for(int i = a; i <= b; i++)
#define Forr(i, a, b) for(int i = a; i >= b; i--)
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define sz(x) ((int)x.size())
#define eb emplace_back
#define int LL
using namespace std;
using i32 = int32_t;
using LL = long long;
using pii = pair<int, int>;

const int MAXN = 200'000;
const int MOD = 1'000'002'022;

int n, m;
vector<int> adj[MAXN + 10];
int p[MAXN + 10];
int a[MAXN + 10];

int s[MAXN + 10];

void dfs(int x) {
    if(x >= n) {
        s[x] = 1;
        return;
    }
    s[x] = sz(adj[x]);
    for(auto &i:adj[x]) {
        dfs(i);
        s[x] = s[x] * s[i] % MOD;
    }
}

int ss[MAXN + 10];
void dfs2(int x, int owo) {
    if(x >= n) {
        ss[x] = owo;
        return;
    }
    int l = adj[x][0];
    int r = adj[x][1];
    dfs2(l, owo * s[r] % MOD);
    dfs2(r, owo * s[l] % MOD);
}

int ans = 0;
void update_leaf(int pos, int val) {
    ans = ((ans + val * ss[pos]) % MOD + MOD) % MOD;
}

void init(i32 N, i32 M, std::vector<i32> P, std::vector<i32> A) {
    n = N; m = M;
    p[0] = -1;
    For(i, 1, n + m - 1) {
        adj[P[i]].eb(i);
        p[i] = P[i];
    }
    dfs(0);
    dfs2(0, 1);
    For(i, 0, m - 1) {
        a[n + i] = A[i];
        update_leaf(n + i, A[i]);
    }
}

i32 count_ways(i32 L, i32 R) {
    int i = min(L, R);
    int last = i;
    int d = 1 - 2 * a[i];
    a[i] += d;
    // int cum = 1;
    // while(i != 0) {
    //     i = p[i];
    //     int l = adj[i][0];
    //     int r = adj[i][1];
    //     if(last == l) {
    //         cum = (cum * s[r]) % MOD;
    //     } else {
    //         cum = (cum * s[l]) % MOD;
    //     }
    // }
    // ans = (ans + cum * d) % MOD;
    // ans = (ans + MOD) % MOD;
    update_leaf(i, d);
    return (i32)ans;
}

/*

3 4 3
-1 0 1 2 1 1 0
1 0 1 0
3 4
4 5
3 6

2
0
6

*/

Compilation message (stderr)

circuit.cpp: In function 'i32 count_ways(i32, i32)':
circuit.cpp:77:9: warning: unused variable 'last' [-Wunused-variable]
   77 |     int last = i;
      |         ^~~~

• Subtask 1: 0 / 2
• Subtask 2: 0 / 7
• Subtask 3: 0 / 9
• Subtask 4: 4 / 4
• Subtask 5: 0 / 12
• Subtask 6: 0 / 27
• Subtask 7: 0 / 28
• Subtask 8: 0 / 11