Submission #376020

#	Time	Username	Problem	Language	Result	Execution time	Memory
376020		Aldas25	Cards (LMIO19_korteles)	C++14	35 / 100	640 ms	29168 KiB

korteles

#pragma GCC optimize("O3")

#include <bits/stdc++.h>

using namespace std;

#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr)
#define FOR(i, a, b) for(int i = (a); i <= (b); i++)
#define REP(n) FOR(O, 1, (n))
#define pb push_back
#define f first
#define s second
typedef long double ld;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<int, pii> piii;
typedef vector<int> vi;
typedef vector<pii> vii;
typedef vector<ll> vl;
typedef vector<piii> viii;
//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const int MAXN = 500100, MAXK = 23;
const ll MOD = 1e9+7;
const ll INF = 1e16;
const ld PI = asin(1) * 2;

void setIO () {
    FAST_IO;
}

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

int hsh (int a, int b) {
    return a*26 + b;
}

int hsh (int a, int b, int c) {
    return a*26*26 + b*26 + c;
}

int hsh (int a, int b, int c, int d) {
    return a*26*26*26 + b*26*26 + c*26 + d;
}

int n;
int cards[MAXN][2][2];
unordered_map<int, ll> cntUp, cntDown, cntRight, cntLeft;
unordered_map<int, ll> cntAll;
unordered_map<int, ll> cntUL, cntUR, cntDL, cntDR;

int main() {
	setIO();

    cin >> n;
    FOR(i, 1, n) FOR(j, 0, 1) FOR(k, 0, 1) {
        char c; cin >> c;
        cards[i][j][k] = (c-'A');
    }

    ll ans = 0;
    FOR(i, 1, n) {
        int a = cards[i][0][0], b = cards[i][0][1];
        int c = cards[i][1][0], d = cards[i][1][1];

        ll cur = 0;

        cur += cntUp[hsh(c,d)];
        cur += cntDown[hsh(a,b)];
        cur += cntLeft[hsh(b,d)];
        cur += cntRight[hsh(a,c)];
        cur -= cntAll[hsh(c, d, a, b)];
        cur -= cntAll[hsh(b, a, d, c)];

        if (a == d) {
            cur -= cntUR[hsh(c, a, c)];
            cur -= cntDL[hsh(b, a, b)];
        }
        if (b == c) {
            cur -= cntUL[hsh(b, d, d)];
            cur -= cntDR[hsh(a, a, b)];
        }

        ans += cur;

        cntUp[hsh(a,b)]++;
        cntLeft[hsh(a,c)]++;
        cntRight[hsh(b,d)]++;
        cntDown[hsh(c,d)]++;
        cntAll[hsh(a,b,c,d)]++;
        cntUL[hsh(a,b,c)]++;
        cntUR[hsh(a,b,d)]++;
        cntDL[hsh(a,c,d)]++;
        cntDR[hsh(b,c,d)]++;
    }

    cout << ans << "\n";

	return 0;
}

Compilation message (stderr)

korteles.cpp: In function 'void setIO(std::string)':
korteles.cpp:34:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   34 |   freopen((s+".in").c_str(),"r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
korteles.cpp:35:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   35 |  freopen((s+".out").c_str(),"w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 16 / 16
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 19 / 19
• Subtask 5: 0 / 25