Submission #382084

#	Time	Username	Problem	Language	Result	Execution time	Memory
382084		nikolapesic2802	Flood (IOI07_flood)	C++14	100 / 100	118 ms	30564 KiB

flood

#include<bits/stdc++.h>
#define ios ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define dec(x, y) fixed << setprecision((y)) << (x)
#define xx first
#define yy second
#define srt(v) sort((v).begin(), (v).end())
#define srtr(v) sort((v).rbegin(), (v).rend())
#define pb push_back
#define popb pop_back
#define sz(a) (int)(a).size()
#define len(a) (int)(a).length()
#define mp make_pair
 
using namespace std;
 
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
 
int n, m;
vector<pair<pii, int>> tac;
pii graf[4][100010];
int pos[200010];
stack<int> dosad;
vector<int> dobre;
bool izasao, nap;
int poc;
inline bool ista(int a, int b, int c) {
    if((b<c && a==1) || (b>c && a==2)) return true;
    return false;
}
void dfs(int node, int smer) {
    if(izasao&&node==poc) {
        nap=1;
        return;
    }
    for(int s=smer+1; s<=smer+4; ++s) {
    		if(graf[s%4][node].yy==0)
    				continue;
    		pii adj=graf[s%4][node];
        if(pos[adj.yy]!=3 && !ista(pos[adj.yy], node, adj.xx)) {
            if(pos[adj.yy]!=0) dobre.pb(adj.yy);
            if(node<adj.xx) pos[adj.yy]=1;
            else pos[adj.yy]=2;
            dosad.push(adj.yy);
            izasao=1;
            dfs(adj.xx, (s%4)^2);
            if(nap==1) return;
        }
    }
}
void gotovo() {
    while(!dosad.empty()) {
        int tren=dosad.top();
        pos[tren]=3;
        dosad.pop();
    }
}
bool cmp(pair<pii, int> &A, pair<pii, int> &B) {
    if(A.xx.xx<B.xx.xx) return true;
    if(A.xx.xx>B.xx.xx) return false;
    if(A.xx.yy>B.xx.yy) return true;
    if(A.xx.yy<B.xx.yy) return false;
    return A.yy<B.yy;
}
int main() {
    /// pos: 0 neposecena, 1 u smeru od manjeg ka vecem, 2 suprotno, 3 skroz gotova
    /// graf: 0 gore, 1 desno, 2 dole, 3 levo
    ios;
    cin >> n;
    for(int i=1; i<=n; ++i) {
        int x, y; cin >> x >> y;
        tac.pb(mp(mp(x, y), i));
    }
    cin >> m;
    for(int i=1; i<=m; ++i) {
        int u, v; cin >> u >> v;
        int kod;
        if(tac[u-1].xx.yy==tac[v-1].xx.yy) {
            if(tac[u-1].xx.xx>tac[v-1].xx.xx) kod=3;
            else kod=1;
        }
        else {
            if(tac[u-1].xx.yy<tac[v-1].xx.yy) kod=0;
            else kod=2;
        }
        graf[kod][u]=mp(v, i);
        graf[kod^2][v]=mp(u, i);
    }
    sort(tac.begin(), tac.end(), cmp);
    for(int i=0; i<n; ++i) {
        izasao=0;
        poc=tac[i].yy;
        nap=0;
        dfs(tac[i].yy, 0);
        gotovo();
        izasao=0;
        poc=tac[i].yy;
        nap=0;
        dfs(tac[i].yy, 0);
        gotovo();
    }
    cout << sz(dobre) << "\n";
    for(auto dd:dobre) {
        cout << dd << "\n";
    }
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 3 / 3
• Subtask 5: 10 / 10
• Subtask 6: 3 / 3
• Subtask 7: 3 / 3
• Subtask 8: 3 / 3
• Subtask 9: 3 / 3
• Subtask 10: 9 / 9
• Subtask 11: 9 / 9
• Subtask 12: 9 / 9
• Subtask 13: 9 / 9
• Subtask 14: 9 / 9