Submission #1134394

#	Time	Username	Problem	Language	Result	Execution time	Memory
1134394		aliarapov	Naval battle (CEOI24_battle)	C++20	36 / 100	155 ms	25312 KiB

Main

#include <bits/stdc++.h> 
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std; 
using namespace __gnu_pbds;

#define int long long
#define all(x) x.begin(),x.end() 
#define rall(x) x.rbegin(),x.rend()
           
template<class T, class U> inline bool chmin(T& a, const U& b) { if (a > b) { a = b; return true; } return false; }
template<class T, class U> inline bool chmax(T& a, const U& b) { if (a < b) { a = b; return true; } return false; } 

template <typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
 
template <typename T>
using ordered_multiset = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;     

void solve() {
    int n;
    cin >> n;
    if (n > 5000) {
        map<int, vector<tuple<int, bool, int> > > mp;
        for (int i = 0; i < n; i++) {
            int x, y;
            string dir;
            cin >> x >> y >> dir;
            mp[x + y].push_back({x, dir[0] == 'S', i + 1});
        }
        vector<int> ans;
        for (auto [sum, v] : mp) {
            vector<int> c;
            sort(all(v));
            for (auto [x, ty, ind] : v) {
                if (ty == 0) c.push_back(ind);
                else {
                    if (c.empty()) ans.push_back(ind);
                    else c.pop_back();
                }
            }
            for (int i : c) ans.push_back(i);
        }
        for (int i : ans) cout << i << '\n';
    } else {
        vector<array<int, 2> > a(n);
        vector<char> t(n);
        for (int i = 0; i < n; i++) {
            int x, y;
            char dir;
            cin >> x >> y >> dir;
            a[i] = {x, y};
            t[i] = dir;
        }
        vector<array<int, 3> > v;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
                if (t[i] == 'N' and t[j] == 'W' and a[i][0] + a[i][1] == a[j][0] + a[j][1]) v.push_back({a[j][0] - a[i][0], i, j});
                if (t[i] == 'E' and t[j] == 'S' and a[i][0] + a[i][1] == a[j][0] + a[j][1]) v.push_back({a[j][0] - a[i][0], i, j});
                if (t[i] == 'E' and t[j] == 'N' and a[i][0] - a[i][1] == a[j][0] - a[j][1]) v.push_back({a[j][0] - a[i][0], i, j});
                if (t[i] == 'S' and t[j] == 'W' and a[i][0] - a[i][1] == a[j][0] - a[j][1]) v.push_back({a[j][0] - a[i][0], i, j});
                if (t[i] == 'E' and t[j] == 'W' and a[i][1] == a[j][1]) v.push_back({a[j][0] - a[i][0], i, j});
                if (t[i] == 'N' and t[j] == 'S' and a[i][0] == a[j][0]) v.push_back({a[i][1] - a[j][1], i, j});
            }
        }
        sort(all(v));
        vector<int> vis(n);
        for (auto [val, i, j] : v) {
            if (val < 0) continue;
            if (!vis[i] and !vis[j]) {
                vis[i] = val;
                vis[j] = val;
            } else if (!vis[i] and val == vis[j]) {
                vis[i] = val;
            } else if (!vis[j] and val == vis[i]) {
                vis[j] = val;
            }
        }
        vector<int> ans;
        for (int i = 0; i < n; i++) if (!vis[i]) ans.push_back(i);
        for (int i : ans) cout << i + 1 << '\n';
    }
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);cout.tie(nullptr);

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

• Subtask 0: 0 / 0
• Subtask 1: 6 / 6
• Subtask 2: 0 / 12
• Subtask 3: 0 / 8
• Subtask 4: 0 / 11
• Subtask 5: 0 / 9
• Subtask 6: 30 / 30
• Subtask 7: 0 / 24