Submission #538211

#	Time	Username	Problem	Language	Result	Execution time	Memory
538211		idas	Cutting a rectangle (LMIO18_staciakampis)	C++11	0 / 100	20 ms	5024 KiB

staciakampis

#include <bits/stdc++.h>
#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr); cout.tie(nullptr)
#define FOR(i, begin, end) for(int i = (begin); i < (end); i++)
#define TSTS int ttt; cin >> ttt; while(ttt--) solve()
#define all(x) (x).begin(), (x).end()
#define le(vec) vec[vec.size()-1]
#define sz(x) ((int)((x).size()))
#define pb push_back
#define s second
#define f first

using namespace std;
typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef map<int, int> mii;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
typedef pair<long double, long double> pdd;

const int INF=1e9, MOD=1e9+7, mod=998244353;
const ll LINF=1e13;

void setIO()
{
    FAST_IO;
}

void setIO(string s)
{
    FAST_IO;
    freopen((s+".in").c_str(), "r", stdin);
    freopen((s+".out").c_str(), "w", stdout);
}

const int N=1e5+10, M=5e6+10;
int n, a[N], b[N];
vector<pii> inf, sa, sb;
bool v[M];

bool can(int x, int y, int vis)
{
//    FOR(i, 1, n)
//    {
//        if(i==vis) continue;
//        if(a[i]==x){
//            y-=b[i];
//        }
//        else if(a[i]==y){
//            x-=b[i];
//        }
//        else{
//            return false;
//        }
//    }
//    return true;

    map<int, set<int>> ar, br;
    FOR(i, 1, n)
    {
        if(i==vis) continue;
        ar[sa[i].f].insert(sa[i].s);
        br[sb[i].f].insert(sb[i].s);
    }

    function<pii(int)> eg_a=[&](int x){
        if(sz(ar[x])){
            int rt=*ar[x].begin();
            ar[x].erase(ar[x].begin());
            return pii({x,rt});
        }
        else return pii({-1,-1});
    };

    function<pii(int)> eg_b=[&](int x){
        if(sz(br[x])){
            int rt=*br[x].begin();
            br[x].erase(br[x].begin());
            return pii({x,rt});

        }
        else return pii({-1,-1});
    };

    int usd=0;
    while(true){
        if(x<y) swap(x, y);
        pii now=eg_a(x);
        if(now.f!=-1 && now.s<=y){
            y-=now.s;
            usd++;
            continue;
        }

        now=eg_a(y);
        if(now.f!=-1 && now.s<=x){
            x-=now.s;
            usd++;
            continue;
        }

        now=eg_b(x);
        if(now.f!=-1 && now.s<=y){
            y-=now.s;
            usd++;
            continue;
        }

        now=eg_b(y);
        if(now.f!=-1 && now.s<=x){
            x-=now.s;
            usd++;
            continue;
        }
        break;
    }

    if(usd==n-2){
        return true;
    }
    else{
        return false;
    }
}

int main()
{
    setIO();
    cin >> n;
    ll area=0;
    FOR(i, 0, n)
    {
        cin >> a[i] >> b[i];
        area+=a[i]*b[i];
        inf.pb({a[i],b[i]});
    }
    sort(all(inf), greater<pii>());
    FOR(i, 0, n) a[i]=inf[i].f, b[i]=inf[i].s;

    FOR(i, 0, n)
    {
        sa.pb(inf[i]);
        sb.pb({inf[i].s, inf[i].f});
    }

    //sort(all(sa)); sort(all(sb));

    set<int> ans;
    FOR(i, 1, n)
    {
        int x=a[i], y=a[0]-b[i];
        if((a[i]+b[0])*(a[0])==area){
            if(can(x, y, i)){
                ans.insert(min(a[i]+b[0], a[0]));
            }
        }

        x=a[i]-b[0]; y=a[0];
        if((a[i])*(a[0]+b[i])==area){
            if(can(x, y, i)){
                ans.insert(min(a[i], a[0]+b[i]));
            }
        }
    }
    FOR(i, 1, n)
    {
        if(v[b[i]]) continue;
        v[b[i]]=true;
        int x=b[i]-b[0], y=a[0];
        if((b[i])*(a[0]+a[i])==area){
            if(can(x, y, i)){
                ans.insert(b[i]);
            }
        }

        x=b[i]; y=a[0]-a[i];
        if((b[i]+b[0])*a[0]==area){
            if(can(x, y, i)){
                ans.insert(min(b[i]+b[0], a[0]));
            }
        }
    }
    int cur=b[0];
    bool bad=false;
    FOR(i, 1, n)
    {
        if(a[i]!=cur && b[i]!=cur){
            bad=true;
        }
    }
    if(!bad){
        ans.insert(cur);
    }

    cout << sz(ans) << "\n";
    for(auto x : ans){
        cout << x << "\n";
    }
}

Compilation message (stderr)

staciakampis.cpp: In function 'void setIO(std::string)':
staciakampis.cpp:32:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |     freopen((s+".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
staciakampis.cpp:33:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     freopen((s+".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 25
• Subtask 2: 0 / 20
• Subtask 3: 0 / 55