제출 #589002

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
589002		maomao90	Boarding Passes (BOI22_passes)	C++17	0 / 100	1 ms	468 KiB

passes

// Hallelujah, praise the one who set me free
// Hallelujah, death has lost its grip on me
// You have broken every chain, There's salvation in your name
// Jesus Christ, my living hope
#include <bits/stdc++.h> 
using namespace std;

#define REP(i, s, e) for (int i = (s); i < (e); i++)
#define RREP(i, s, e) for (int i = (s); i >= (e); i--)
template <class T>
inline bool mnto(T& a, T b) {return a > b ? a = b, 1 : 0;}
template <class T>
inline bool mxto(T& a, T b) {return a < b ? a = b, 1: 0;}
typedef long long ll;
typedef long double ld;
#define FI first
#define SE second
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
typedef tuple<int, int, int> iii;
#define ALL(_a) _a.begin(), _a.end()
#define SZ(_a) (int) _a.size()
#define pb push_back
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ii> vii;
typedef vector<iii> viii;

#ifndef DEBUG
#define cerr if (0) cerr
#endif

const int INF = 1000000005;
const ll LINF = 1000000000000000005ll;
const int MAXN = 100005;

int n, g;
string s;

ld calc(int n) {
    return (ld) ((ll) n * (n - 1) / 2) / 2;
}

int main() {
    #ifndef DEBUG
    ios::sync_with_stdio(0), cin.tie(0);
    #endif
    cout << setprecision(9);
    cin >> s;
    n = SZ(s);
    REP (i, 0, n) {
        mxto(g, s[i] - 'A' + 1);
    }
    assert(g == 1);
    int ln = n / 2, rn = n - ln;
    ld ans1 = ((ld) ln * (ln - 1) + (ld) rn * (rn - 1)) / 4;
    ld ans = calc(ln) + calc(rn);
    cout << ans1 << '\n';
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

passes.cpp: In function 'int main()':
passes.cpp:58:8: warning: unused variable 'ans' [-Wunused-variable]
   58 |     ld ans = calc(ln) + calc(rn);
      |        ^~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 25
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40