Submission #1073990

#	Time	Username	Problem	Language	Result	Execution time	Memory
1073990		GrindMachine	Naval battle (CEOI24_battle)	C++17	6 / 100	3103 ms	194752 KiB

Main

#include <bits/stdc++.h>
using namespace std;

typedef long long int ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define conts continue
#define sz(a) (int)a.size()
#define ff first
#define ss second
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()

#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)

template<typename T>
void amin(T &x, T y){
	x = min(x,y);
}

template<typename T>
void amax(T &x, T y){
	x = max(x,y);
}

template<typename A,typename B>
string to_string(pair<A,B> p);

string to_string(const string &s){
	return "'"+s+"'";
}

string to_string(const char* s){
	return to_string((string)s);
}

string to_string(bool b){
	return b?"true":"false";
}

template<typename A>
string to_string(A v){
	string res = "{";
	trav(x,v){
		res += to_string(x)+",";
	}
	if(res.back() == ',') res.pop_back();
	res += "}";
	return res;
}

template<typename A,typename B>
string to_string(pair<A,B> p){
	return "("+to_string(p.ff)+","+to_string(p.ss)+")";
}

#define debug(x) cout << "[" << #x << "]: "; cout << to_string(x) << endl

const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = 1e9 + 5;
const ll inf2 = (ll)1e18 + 5;

void solve(int test_case){
	int n; cin >> n;
	vector<array<int,3>> a(n+5);
	rep1(i,n){
		int r,c; cin >> r >> c;
		char ch; cin >> ch;
		swap(r,c);
		int d = -1;
		if(ch == 'E') d = 0;
		if(ch == 'W') d = 1;
		if(ch == 'S') d = 2;
		if(ch == 'N') d = 3;
		a[i] = {r,c,d};
	}

	map<int,set<pii>> mpr,mpc,mpsum,mpdiff;
	rep1(i,n){
		auto [r,c,d] = a[i];
		mpr[r].insert({c,i});
		mpc[c].insert({r,i});
		mpsum[r+c].insert({r,i});
		mpdiff[r-c].insert({r,i});
	}

	int mnt = 2*inf1;
	vector<int> del;

	auto upd = [&](int i, int j){
		if(a[i][2] > a[j][2]) swap(i,j);
		auto [ri,ci,di] = a[i];
		auto [rj,cj,dj] = a[j];
		if(di == dj) return;

		int t = inf1;

		if((di^1) == dj){
			if(di == 0){
				if(ci <= cj){
					t = (cj-ci)/2;
				}
			}
			else{
				if(ri <= rj){
					t = (rj-ri)/2;
				}
			}
		}
		else{
			if(di == 0){
				if(ci <= cj){
					if(dj == 2){
						if(ri-rj == cj-ci){
							t = abs(ri-rj);
						}
					}
					else{
						if(rj-ri == cj-ci){
							t = abs(ri-rj);
						}
					}
				}
			}
			else{
				if(ci >= cj){
					if(dj == 2){
						if(ri-rj == ci-cj){
							t = abs(ri-rj);
						}
					}
					else{
						if(rj-ri == ci-cj){
							t = abs(ri-rj);
						}
					}
				}
			}
		}

		if(t > mnt) return;
		if(t < mnt){
			del.clear();
		}
		mnt = t;
		del.pb(i), del.pb(j);
	};

	vector<bool> rem(n+5);

	while(true){
		mnt = 2*inf1;
		del.clear();

		for(auto &mp : {mpr,mpc,mpsum,mpdiff}){
			for(auto &[val,st] : mp){
				int p = -1;
				for(auto [c,i] : st){
					if(p != -1){
						upd(i,p);
					}
					p = i;
				}
			}
		}

		if(mnt == 2*inf1) break;

		trav(i,del){
			rem[i] = 1;
			auto [r,c,d] = a[i];
			mpr[r].erase({c,i});
			mpc[c].erase({r,i});
			mpsum[r+c].erase({r,i});
			mpdiff[r-c].erase({r,i});
		}
	}

	vector<int> ans;
	rep1(i,n){
		if(!rem[i]){
			ans.pb(i);
		}
	}

	trav(x,ans) cout << x << endl;
}

int main(){
	fastio;

	int t = 1;
	// cin >> t;

	rep1(i,t){
		solve(i);
	}

	return 0;
}

• 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: 0 / 30
• Subtask 7: 0 / 24