Submission #674061

#	Time	Username	Problem	Language	Result	Execution time	Memory
674061		Ronin13	Digital Circuit (IOI22_circuit)	C++17	100 / 100	1101 ms	144304 KiB

circuit

#include "circuit.h"

#include <vector>
#include <bits/stdc++.h>
#define ll long long
#define ull unsigned ll
#define f first
#define s second
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pb push_back
#define epb emplace_back
using namespace std;
const ll mod = 1e9 + 2022;
const int nmax = 1e6 + 1;

vector <vector <int> > g(nmax);
vector <int> lazy(4* nmax);
vector <ll>t(4 * nmax), t1(4 * nmax);
/*
3 4 3
-1 0 1 2 1 1 0
1 0 1 0
3 4
4 5
3 6
*/
void push(int v){
    if(!lazy[v]) return;
    lazy[2 * v] ^= lazy[v];
    lazy[2 * v + 1] ^= lazy[v];
    swap(t[2 * v], t1[2 * v]);
    swap(t[2 * v + 1], t1[2 * v + 1]);
    lazy[v] = 0;
}

void update(int v, int l, int r, int st, int fin){
    if(l > fin || r < st) return;
    if(l >= st && r <= fin){
        swap(t[v], t1[v]);
        lazy[v] ^= 1;
        return;
    }
    int m = (l + r) / 2;
    push(v);
    update(2 * v, l, m, st, fin);
    update(2 * v + 1, m + 1, r, st, fin);
    t[v] = t[2 * v] + t[2 * v + 1]; t[v] %= mod;
    t1[v] = t1[2 * v] + t1[2 * v + 1]; t1[v] %= mod;
}

vector <int> a;
vector <ll> val(nmax);
int n;
void build(int v, int l, int r){
    if(l == r){
        if(a[l - 1]){
            t[v] = val[l + n];
            return;
        }
        else t1[v] = val[l + n];
        return;
    }
    int m = (l + r) / 2;
    build(2 * v, l, m);
    build(2 * v + 1, m + 1, r);
    t[v] = t[2 * v] + t[2 * v + 1]; t[v] %= mod;
    t1[v] = t1[2 * v] + t1[2 * v + 1]; t1[v] %= mod;
}
vector <ll> dp(nmax);


void dfs(int v){
    dp[v] = max((int)g[v].size(), 1);
    for(int to : g[v]){
        dfs(to);
        dp[v] *= dp[to];
        dp[v] %= mod;
    }

}

void DFS(int v, ll value = 1){
    vector <ll> pref, suf;
    pref.resize(g[v].size());
    suf.resize(g[v].size());
    for(int i = 0; i < g[v].size(); i++){
        if(i == 0) pref[i] = dp[g[v][i]];
        else pref[i] = dp[g[v][i]] * pref[i - 1] % mod;
    }
    for(int i = g[v].size() - 1; i >= 0; i--){
        if(i == g[v].size() - 1){
            suf[i] = dp[g[v][i]];
        }
        else suf[i] = suf[i + 1] * dp[g[v][i]] % mod;
    }
    for(int i = 0; i < g[v].size(); i++){
        val[g[v][i]] = value;
        int u = g[v][i];
        if(i) val[u] *= pref[i - 1], val[u] %= mod;
        if(i != g[v].size() - 1)
            val[u] *= suf[i + 1], val[u] %= mod;
        DFS(u, val[u]);
    }
}
int m;
void init(int N, int M, std::vector<int> P, std::vector<int> A) {
    n = N;
    m = M;
    a = A;
    for(int i = 0; i < n + m; i++){
        int x = P[i];
        if(x != -1)
        g[x + 1].pb(i + 1);
    }
    dfs(1);
    DFS(1);
    /*for(int i = 1; i <= n + m; i++){
        cout << dp[i] << ' ';
    }
    cout << "\n";
    for(int i = 1; i <= m; i++) cout << val[i + n] << ' ';*/
    build(1, 1, m);
   // cout << t[1] << ' ';
}

int count_ways(int L, int R) {
    update(1, 1, m, L - n + 1, R - n + 1);
  return t[1];
}

Compilation message (stderr)

circuit.cpp: In function 'void DFS(int, long long int)':
circuit.cpp:87:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   87 |     for(int i = 0; i < g[v].size(); i++){
      |                    ~~^~~~~~~~~~~~~
circuit.cpp:92:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   92 |         if(i == g[v].size() - 1){
      |            ~~^~~~~~~~~~~~~~~~~~
circuit.cpp:97:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   97 |     for(int i = 0; i < g[v].size(); i++){
      |                    ~~^~~~~~~~~~~~~
circuit.cpp:101:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  101 |         if(i != g[v].size() - 1)
      |            ~~^~~~~~~~~~~~~~~~~~

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