Submission #545777

#	Time	Username	Problem	Language	Result	Execution time	Memory
545777		baojiaopisu	Ili (COI17_ili)	C++14	0 / 100	3 ms	596 KiB

ili

#include<bits/stdc++.h>

using namespace std;

using ll = long long;
using ld = long double;
using ull = unsigned long long;

using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pld = pair<ld, ld>;

#define fi first
#define se second
#define pb push_back
#define pf push_front
#define mp make_pair
#define ins insert
#define btpc __builtin_popcount
#define btclz __builtin_clz

#define sz(x) (int)(x.size());
#define all(x) x.begin(), x.end()
#define debug(...) " [" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int d4x[4] = {1, 0, -1, 0}; int d4y[4] = {0, 1, 0, -1};
int d8x[8] = {0, 1, 1, 1, 0, -1, -1, -1};
int d8y[8] = {1, 1, 0, -1, -1, -1, 0, 1};

template<class X, class Y>
    bool minimize(X &x, const Y &y) {
        if (x > y)
        {
            x = y;
            return true;
        }
        return false;
    }
template<class X, class Y>
    bool maximize(X &x, const Y &y) {
        if (x < y)
        {
            x = y;
            return true;
        }
        return false;
    }

const int MOD = 1e9 + 7; //998244353

template<class X, class Y>
	void add(X &x, const Y &y) {
		x = (x + y);
		if(x >= MOD) x -= MOD;
	}

template<class X, class Y> 
	void sub(X &x, const Y &y) {
		x = (x - y);
		if(x < 0) x += MOD;
	}

/* Author : Le Ngoc Bao Anh, 11A5, LQD High School for Gifted Student*/

const ll INF = 1e9;
const int N = 3e5 + 10;

int par[N][2];
int cnt[N], res[N], ans[N];

void solve() {
	int n, m; cin >> n >> m;
	string s; cin >> s;
	s = "#" + s;
	for(int i = 1; i <= n + m; i++) ans[i] = -1;

	for(int i = 1; i <= m; i++) {
		if(s[i] == '0') ans[i + n] = 0;
		if(s[i] == '1') ans[i + n] = 1;
	}

	for(int i = 1; i <= m; i++) {
		string a, b; cin >> a >> b;
		int u = a[1] - '0';
		if(a[0] == 'c') u += n;
		par[i + n][0] = u;

		u = b[1] - '0';
		if(a[0] == 'c') u += n;
		par[i + n][1] = u;
	}

	for(int i = m + n; i > n; i--) {
		if(ans[i] == 0) ans[par[i][0]] = ans[par[i][1]] = 0;
	}

	for(int i = 1; i <= n; i++) cnt[i] = (ans[i] == 0 ? 0 : 1);
	for(int i = n + 1; i <= n + m; i++) {
		cnt[i] = cnt[par[i][0]] + cnt[par[i][1]];
		if(cnt[i] == 0) ans[i] = 0;
	}

	for(int i = n + 1; i <= n + m; i++) {
		if(ans[i] != -1) continue;
		for(int j = 1; j <= n + m; j++) res[j] = ans[j];
		res[i] = 0;

		for(int j = n + m; j > n; j--) {
			if(res[j] == 0) res[par[j][0]] = res[par[j][1]] = 0;
		}

		for(int j = 1; j <= n; j++) cnt[j] = (res[j] == 0 ? 0 : 1);
		for(int j = n + 1; j <= n + m; j++) {
			cnt[j] = cnt[par[j][0]] + cnt[par[j][1]];
			if(cnt[j] == 0 && res[j] == 1) ans[i] = 1;
		}
	}

	for(int i = n + 1; i <= n + m; i++) {
		if(ans[i] == -1) cout << '?';
		else cout << ans[i];
	}
}

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    #ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    #else 
    //online
    #endif

    int tc = 1, ddd = 0;
    // cin >> tc;
    while(tc--) {
        //ddd++;
        //cout << "Case #" << ddd << ": ";
        solve();
    }
}

Compilation message (stderr)

ili.cpp: In function 'int main()':
ili.cpp:137:17: warning: unused variable 'ddd' [-Wunused-variable]
  137 |     int tc = 1, ddd = 0;
      |                 ^~~
ili.cpp:131:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  131 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
ili.cpp:132:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  132 |     freopen("output.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 42
• Subtask 3: 0 / 51