제출 #1045298

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1045298		Lobo	Joker (BOI20_joker)	C++17	0 / 100	4 ms	16888 KiB

Joker

#include<bits/stdc++.h>
using namespace std;
const long long inf = 1e18 + 10;
const int inf1 = 1e9 + 10;
#define int long long
#define dbl long double
#define endl '\n'
#define sc second
#define fr first
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()
mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());
const int maxn = 2e5+10;
const int B = 1;
int n, m, q, col[maxn], colc[2*maxn], ansl[maxn];
vector<int> g[maxn], gc[2*maxn]; 
pair<int,int> edg[maxn];

bool okcol;
void dfscol(int u) {
    for(auto v : g[u]) {
        if(col[v] == -1) {
            col[v] = (col[u]^1);
            dfscol(v);
        }
        else if(col[v] != (col[u]^1)) {
            okcol = 0;
        }
    }
}
bool okcolc;
void dfscolc(int u) {
    for(auto v : gc[u]) {
        if(colc[v] == -1) {
            colc[v] = (colc[u]^1);
            dfscolc(v);
        }
        else if(colc[v] != (colc[u]^1)) {
            okcolc = 0;
        }
    }
}

void solve() {
    cin >> n >> m >> q;
    for(int i = 1; i <= m; i++) {
        int u,v;
        cin >> u >> v;
        edg[i] = mp(u,v);
    }

    int bLl = 0;
    int bLr = min(m+1,B-1);
    int bRl = 1;
    int bRr = min(m+1,B);
    while(bLl != m+1) {
        for(int i = 1; i <= n; i++) {
            g[i].clear();
            col[i] = -1;
        }
        for(int i = 1; i <= bLl-1; i++) {
            int u = edg[i].fr;
            int v = edg[i].sc;
            g[u].pb(v);
            g[v].pb(u);
        }
        for(int i = bRr+1; i <= m; i++) {
            int u = edg[i].fr;
            int v = edg[i].sc;
            g[u].pb(v);
            g[v].pb(u);
        }
        int cntcol = 0;
        okcol = 1;
        for(int i = 1; i <= n; i++) {
            if(col[i] == -1) {
                colc[cntcol] = -1;
                colc[cntcol+1] = -1;
                col[i] = cntcol;
                cntcol = cntcol+2;
                dfscol(i);
            }
        }
        if(okcol == 0) {
            if(bRr == m+1) {
                for(int i = bLl; i <= m+1; i++) {
                    ansl[i] = inf;
                }
                bLl = m+1;
                continue;
            }
            bRl = min(m+1,bRr+1);
            bRr = min(m+1,bRl+B-1);
            continue;
        }

        int L = bLl;
        int R = bRl;

        while(L <= bLr and R <= bRr) {
            vector<int> verts;
            for(int i = bLl; i <= L; i++) {
                if(i == 0 or i == m+1) continue;
                int u = edg[i].fr; verts.pb(u);
                int v = edg[i].sc; verts.pb(v);
                gc[col[u]].pb(col[v]);
                gc[col[v]].pb(col[u]);
            }
            for(int i = R; i <= bRr; i++) {
                if(i == 0 or i == m+1) continue;
                int u = edg[i].fr; verts.pb(u);
                int v = edg[i].sc; verts.pb(v);
                gc[col[u]].pb(col[v]);
                gc[col[v]].pb(col[u]);
            }
            okcolc = 1;
            for(auto i : verts) {
                if(colc[col[i]] == -1) {
                    colc[col[i]] = 0;
                    dfscolc(col[i]);
                }
            }

            if(okcolc == 1) {
                ansl[L] = R;
                L++;
            }
            else if(R == m+1) {
                ansl[L] = inf;
                L++;
            }
            else {
                R++;
            }

            for(auto i : verts) {
                colc[col[i]] = -1;
                gc[col[i]].clear();
            }
        }

        bLl = min(m+1,L);
        bLr = (min(m+1,bLl+B-1));
        bRl = min(m+1,R);
        bRr = min(m+1,bRl+B-1);
    }
    for(int i = 1; i <= q; i++) {
        int l,r;
        cin >> l >> r;
        if(ansl[l-1] <= r+1) {
            cout << "NO" << endl;
        }
        else {
            cout << "YES" << endl;
        }
    }
}

int32_t main() {
    ios::sync_with_stdio(false); cin.tie(0);

    #ifndef ONLINE_JUDGE
    freopen("in.in", "r", stdin);
    freopen("out.out", "w", stdout);
    #endif

    int tt = 1;
    // cin >> tt;
    while(tt--) {
        solve();
    }

}

컴파일 시 표준 에러 (stderr) 메시지

Joker.cpp: In function 'int32_t main()':
Joker.cpp:164:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  164 |     freopen("in.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
Joker.cpp:165:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  165 |     freopen("out.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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• Subtask 3: 0 / 25
• Subtask 4: 0 / 10
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• Subtask 6: 0 / 29