Submission #1103259

#	Time	Username	Problem	Language	Result	Execution time	Memory
1103259		koukirocks	Naval battle (CEOI24_battle)	C++17	46 / 100	1862 ms	1048576 KiB

Main

#include <bits/stdc++.h>
#define speed ios_base::sync_with_stdio(0); cin.tie(0)
#define all(x) (x).begin(),(x).end()
#define F first
#define S second
//#pragma GCC optimize("O3,unroll-loops")
//#pragma GCC target("avx,avx2")
//#pragma GCC target("popcnt")
 
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ldb;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
 
const ll MAX=2e5+10,P=1e9+7;
const ll INF=0x3f3f3f3f,oo=0x3f3f3f3f3f3f3f3f;
const ldb eps=1e-6;
const ldb PI=acos(-1.0);
const ll dir[4][2]={{0,-1},{0,1},{1,0},{-1,0}};
template<typename T>
using vvector = vector<vector<T>>;

int main() {
    speed;
    ll n;
    cin>>n;
    vector<pair<pll,ll>> p(n+1);
    for (int i=1;i<=n;i++) {
        char c;
        cin>>p[i].F.F>>p[i].F.S>>c;
        if (c=='N') p[i].S=0;
        else if (c=='S') p[i].S=1;
        else if (c=='E') p[i].S=2;
        else p[i].S=3;
    }
    vector<pair<ll,pll>> coll;
    for (int i=1;i<=n;i++) {
        for (int j=i+1;j<=n;j++) {
            if (p[i].S==p[j].S) continue;
            if (dir[p[i].S][0]==0 and dir[p[j].S][0]==0) {
                if (p[i].F.F!=p[j].F.F) continue;
                ll d = p[j].F.S-p[i].F.S;
                d/=dir[p[i].S][1];
                if (d<0) continue;
                coll.push_back(pair(d/2,pair(i,j)));
            } else if (dir[p[i].S][1]==0 and dir[p[j].S][1]==0) {
                if (p[i].F.S!=p[j].F.S) continue;
                ll d = p[j].F.F-p[i].F.F;
                d/=dir[p[i].S][0];
                if (d<0) continue;
                coll.push_back(pair(d/2,pair(i,j)));
            } else if (dir[p[i].S][0]==0) {
                ll t1=(p[j].F.S-p[i].F.S)/dir[p[i].S][1];
                ll t2=(p[i].F.F-p[j].F.F)/dir[p[j].S][0];
                if (t1<0 or t2<0 or t1!=t2) continue;
                coll.push_back(pair(t1,pair(i,j)));
            } else {
                ll t1=(p[j].F.F-p[i].F.F)/dir[p[i].S][0];
                ll t2=(p[i].F.S-p[j].F.S)/dir[p[j].S][1];
                if (t1<0 or t2<0 or t1!=t2) continue;
                coll.push_back(pair(t1,pair(i,j)));
            }
        }
    }
    vector<ll> ans(n+1,oo);
    sort(all(coll));
    for (auto [t,ij] : coll) {
        // cout<<t<<" "<<ij.F<<" "<<ij.S<<"\n";
        if (ans[ij.F]>=t and ans[ij.S]>=t) {
            ans[ij.F]=t;
            ans[ij.S]=t;
        }
    }
    for (int i=1;i<=n;i++) {
        if (ans[i]==oo) cout<<i<<"\n";
    }
    return 0;
}

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