제출 #1370072

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1370072		rexdino	Pictionary (COCI18_pictionary)	C++20	140 / 140	104 ms	13860 KiB

pictionary

#include <bits/stdc++.h>
#define fi first
#define se second
#define FOR(i, a, b) for(int i=(a); i<=(b); ++i)
#define REP(i, a, b) for(int i=(a); i>=(b); --i)
#define BIT(x, i) (((x) >> (i)) & 1)
#define MASK(i) (1LL << (i))
#define sz(v) (int)(v).size()
#define ALL(v) (v).begin(),(v).end()
using namespace std;
    
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

template <class T1, class T2> bool ckmax(T1 &a, T2 b){ if (a < b) {a = b; return 1;}return 0;}
template <class T1, class T2> bool ckmin(T1 &a, T2 b){ if (a > b) {a = b; return 1;}return 0;}

const int N = 1e6 + 5;
const int mod = 1e9 + 7;
const int base = 311;
const ll INF = 1e18;

// Author: rexdino
int n, m, q;
pii Q[N];
int l[N], r[N], ans[N];
vector<int> adj[N];

struct DSU{
	vector<int> par;
	DSU(int _n){
		par.assign(n + 2, -1);
	}

	int Find(int u){
		return par[u] < 0 ? u : par[u] = Find(par[u]);
	}

	void join(int u, int v){
		u = Find(u); v = Find(v);
		if (u == v) return;

		if (par[u] > par[v]) swap(u, v);
		par[u] += par[v];
		par[v] = u;
	}
};

void solve(){
	cin >> n >> m >> q;
	FOR(i, 1, q) cin >> Q[i].fi >> Q[i].se;

	FOR(i, 1, q){
		l[i] = 1, r[i] = m;
	}


	FOR(i, 1, 20){
		FOR(i, 1, q){
			if (l[i] > r[i]) continue;
			int mid = (l[i] + r[i]) >> 1;
			adj[mid].push_back(i);
		}

		DSU dsu = DSU(n);
		REP(i, m, 1){
			for (int j=2*i;j<=n;j+=i){
				dsu.join(j, j - i);
			}

			for (int id : adj[i]){
				if (dsu.Find(Q[id].fi) == dsu.Find(Q[id].se)){
					ans[id] = i;
					l[id] = i + 1;
				} else r[id] = i - 1;
				// cerr << id << " " << i << "  " << ans[id] << "\n";
			}

			adj[i].clear();
		}
	}
	FOR(i, 1, q) cout << m - ans[i] + 1 << "\n";
}

signed main(){
    #define NAME "main"
    if (fopen(NAME".inp", "r")){
        freopen(NAME".inp", "r", stdin);
        freopen(NAME".out", "w", stdout);
    }
    ios_base::sync_with_stdio(0); cin.tie(0);

    int t = 1;
    // cin >> t;
    while(t--) solve();

    // cerr << "Time elapsed: " << (1.0 * clock() / CLOCKS_PER_SEC) << "s\n";
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

pictionary.cpp: In function 'int main()':
pictionary.cpp:89:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   89 |         freopen(NAME".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
pictionary.cpp:90:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   90 |         freopen(NAME".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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