Submission #251498

#	Time	Username	Problem	Language	Result	Execution time	Memory
251498		Vimmer	Ili (COI17_ili)	C++14	100 / 100	538 ms	664 KiB

ili

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
//
//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("fast-math")
//#pragma GCC optimize("no-stack-protector")

#define F first
#define S second
#define sz(x) int(x.size())
#define pb push_back
#define pf push_front
#define N 100010
#define M ll(1e9 + 7)
#define inf 1e9 + 1e9

using namespace std;
//using namespace __gnu_pbds;

typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef short int si;
typedef array <ll, 3> a3;
typedef array <int, 4> a4;

typedef pair <int, ll> pt;
//typedef tree <int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

int n, m;

string s, t;

pair <int, int> from[N];

void go_bad(int v, bool f)
{
    if (f) s[v] = '0'; else t[v] = '0';

    if (v < m) {go_bad(from[v].F, f); go_bad(from[v].S, f);}
}

bool fnd(int v)
{
    if (v >= m) return (s[v] == '1');

    return fnd(from[v].F) | fnd(from[v].S);
}
int main()
{
      //freopen("mining.in", "r", stdin); freopen("mining.out", "w", stdout);

      ios_base::sync_with_stdio(0); istream::sync_with_stdio(0); cin.tie(0); cout.tie(0);

      cin >> n >> m;

      cin >> s;

      for (int i = 0; i < n; i++) s += '1';

      for (int i = 0; i < m; i++)
      {
          char c1, c2;

          int x1, x2;

          cin >> c1 >> x1 >> c2 >> x2;

          x1--; x2--;

          if (c1 == 'x') x1 += m;

          if (c2 == 'x') x2 += m;

          from[i] = {x1, x2};
      }

      for (int i = 0; i < m; i++)
         if (s[i] == '0') go_bad(i, 1);

      for (int i = 0; i < m; i++)
        if (s[i] == '?')
        {
            if (!fnd(i)) {s[i] = '0'; continue;}

            t = s;

            go_bad(i, 0);

            for (int j = 0; j < m; j++)
              if (t[from[j].F] == '1' || t[from[j].S] == '1') t[j] = '1'; else t[j] = '0';

            bool bad = 0;

            for (int j = 0; j < m; j++)
              if (s[j] == '1' && t[j] == '0') {bad = 1; break;}

            if (bad) s[i] = '1';
        }

    for (int i = 0; i < m; i++) cout << s[i];
}

• Subtask 1: 7 / 7
• Subtask 2: 42 / 42
• Subtask 3: 51 / 51