제출 #404291

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
404291		idas	Cards (LMIO19_korteles)	C++11	0 / 100	121 ms	3080 KiB

korteles

#include <bits/stdc++.h>
#define FOR(i, begin, end) for(int i = (begin); i < (end); i++)
#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr); cout.tie(nullptr)
#define F first
#define S second
#define PB push_back
#define MP make_pair
#define SZ(x) ((int)((x).size()))
#define LE(vec) vec[vec.size()-1]
#define TSTS int t; cin >> t; while(t--)solve()

const int INF = 1e9;
const long long LINF = 1e18;
const long double PI = asin(1)*2;
const int MOD = 1e9+7;

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

void setIO()
{
    FAST_IO;
}

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

unordered_map<string, int> up, down;
map<pii, bool> used;

int main()
{
    setIO();
    int n;
    cin >> n;
    FOR(i, 0, n)
    {
        string a, b;
        cin >> a >> b;
        up[a]++;
        down[b]++;
    }

    ll ans = 0;
    int in1 = 0, in2 = 0;
    for(auto[x, y] : up)
    {
        in2 = 0;
        for(auto[z, w] : down)
        {
            if(x == z && in1!=in2 && !used.count(MP(in1, in2)))
            {
                ans += y*w;
                used[MP(in1, in2)] = true;
                used[MP(in2, in1)] = true;
            }
            in2++;
        }
        in1++;
    }

    cout << ans;
}

컴파일 시 표준 에러 (stderr) 메시지

korteles.cpp: In function 'int main()':
korteles.cpp:53:13: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   53 |     for(auto[x, y] : up)
      |             ^
korteles.cpp:56:17: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   56 |         for(auto[z, w] : down)
      |                 ^
korteles.cpp: In function 'void setIO(std::string)':
korteles.cpp:31:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |   freopen((s+".in").c_str(),"r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
korteles.cpp:32:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |   freopen((s+".out").c_str(),"w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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