QOJ.ac

QOJ

ID题目提交者结果用时内存语言文件大小提交时间测评时间
#607717#9427. Collect the Coinsucup-team4435#WA 22ms4284kbC++203.0kb2024-10-03 15:57:342024-10-03 15:57:35

Judging History

你现在查看的是最新测评结果

  • [2024-11-06 15:56:27]
  • hack成功,自动添加数据
  • (/hack/1139)
  • [2024-10-03 15:57:35]
  • 评测
  • 测评结果:WA
  • 用时:22ms
  • 内存:4284kb
  • [2024-10-03 15:57:34]
  • 提交

answer

#pragma GCC optimize("Ofast")

#include "bits/stdc++.h"

#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rep1(i, n) for (int i = 1; i < (n); ++i)
#define rep1n(i, n) for (int i = 1; i <= (n); ++i)
#define repr(i, n) for (int i = (n) - 1; i >= 0; --i)
#define pb push_back
#define eb emplace_back
#define all(a) (a).begin(), (a).end()
#define rall(a) (a).rbegin(), (a).rend()
#define each(x, a) for (auto &x : a)
#define ar array
#define vec vector
#define range(i, n) rep(i, n)

using namespace std;

using ll = long long;
using ull = unsigned long long;
using ld = long double;
using str = string;
using pi = pair<int, int>;
using pl = pair<ll, ll>;

using vi = vector<int>;
using vl = vector<ll>;
using vpi = vector<pair<int, int>>;
using vvi = vector<vi>;

int Bit(int mask, int b) { return (mask >> b) & 1; }

template<class T>
bool ckmin(T &a, const T &b) {
    if (b < a) {
        a = b;
        return true;
    }
    return false;
}

template<class T>
bool ckmax(T &a, const T &b) {
    if (b > a) {
        a = b;
        return true;
    }
    return false;
}

// [l, r)
template<typename T, typename F>
T FindFirstTrue(T l, T r, const F &predicat) {
    --l;
    while (r - l > 1) {
        T mid = l + (r - l) / 2;
        if (predicat(mid)) {
            r = mid;
        } else {
            l = mid;
        }
    }
    return r;
}


template<typename T, typename F>
T FindLastFalse(T l, T r, const F &predicat) {
    return FindFirstTrue(l, r, predicat) - 1;
}


const ll INF = 2e18;
const int INFi = 1e9;
const int N = 30 + 5;
const int LG = 20;


void solve() {
    int n; cin >> n;
    vl t(n), c(n);
    rep(i, n) cin >> t[i] >> c[i];
    for(int i = 1; i + 1 < n; ++i) {
        if (t[i - 1] == t[i] && t[i] == t[i + 1]) {
            cout << "-1\n";
            return;
        }
    }
    if (set<int>(all(c)).size() <= 2) {
        cout << "0\n";
        return;
    }
    int L = 0;
    int R = (int)1e9 + 1;
    vector<pair<ll, ll>> pts(n);
    while (R - L > 1) {
        int v = (L + R) / 2;
        rep(i, n) {
            pts[i].first = t[i] * v + c[i];
            pts[i].second = t[i] * v - c[i];
        }
        pair<ll, ll> a = {-INF, -INF}, b = {-INF, -INF};
        bool ok = true;
        for(auto &[cx, cy] : pts) {
            if (a.first <= cx && a.second <= cy) {
                a = {cx, cy};
                continue;
            }
            if (b.first <= cx && b.second <= cy) {
                b = {cx, cy};
                swap(a, b);
                continue;
            }
            ok = false;
            break;
        }
        if (ok) {
            R = v;
        } else {
            L = v;
        }
    }
    cout << R << '\n';
}


signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout << setprecision(12) << fixed;
    int t = 1;
    cin >> t;
    rep(i, t) {
        solve();
    }
    return 0;
}

詳細信息

Test #1:

score: 100
Accepted
time: 1ms
memory: 3488kb

input:

3
5
1 1
3 7
3 4
4 3
5 10
1
10 100
3
10 100
10 1000
10 10000

output:

2
0
-1

result:

ok 3 lines

Test #2:

score: -100
Wrong Answer
time: 22ms
memory: 4284kb

input:

1135
2
6 5
8 8
8
2 9
2 10
4 4
5 3
6 2
6 8
8 2
8 7
1
9 1
6
4 6
6 1
6 2
9 10
10 1
10 7
5
1 6
2 5
6 7
8 6
10 3
8
1 10
5 4
5 7
6 1
6 6
8 4
9 1
9 4
8
1 1
1 3
2 9
3 3
5 9
6 10
9 7
10 7
3
5 8
6 6
10 6
7
2 9
4 7
5 10
6 3
6 7
8 9
10 1
6
1 4
2 8
5 9
7 10
9 1
10 5
9
2 7
4 5
5 9
6 10
7 4
9 4
9 9
10 3
10 7
1
3 1...

output:

0
3
0
3
1
3
6
0
3
2
2
0
2
5
0
1
6
1
2
0
0
0
1
4
4
0
2
1
3
0
3
2
3
2
5
4
1
1
0
1
1
1
0
3
0
1
0
1
0
2
1
0
2
3
4
7
1
1
1
0
1
3
0
1
4
4
4
0
0
2
2
6
4
3
1
0
0
1
0
2
1
2
0
1
5
3
0
0
1
2
0
3
0
2
2
2
1
0
0
0
5
1
2
0
6
1
1
1
2
2
2
0
3
1
4
3
6
0
8
1
1
3
0
2
2
4
1
1
0
0
0
7
2
2
1
0
0
3
1
2
1
1
2
8
3
0
3
3
3
5
...

result:

wrong answer 17th lines differ - expected: '5', found: '6'