Submission #320149

#	Time	Username	Problem	Language	Result	Execution time	Memory
320149		Karen124	MP3 Player (CEOI10_mp3player)	C++14	0 / 100	1074 ms	1628 KiB

mp3player

#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;

#define ll long long int 
#define F first
#define S second
#define pb push_back
const ll N = 1e5 + 5;
const ll LOG = 30;
const ll MOD = 1e9 + 7;
const ll INF = 2e9 + 10;
int n, Vmax, V2, a[N], t[N], ansT, ansV1 = V2;
vector <int> dif;
int ok(ll T, bool f){
    int V1 = V2;
    for (int i = n; i >= 2; i--){
        if (t[i] - t[i - 1] <= T){
            V1 -= a[i];
        }
        V1 = max(V1, 0);
        V1 = min(V1, Vmax);
    }
    for (int i = 2; i <= n; i++){
        if (t[i] - t[i - 1] <= T){
            V1 += a[i];
        }
        V1 = max(V1, 0);
        V1 = min(V1, Vmax);
    }
    if (f) return V1;
    else return (V1 == V2);
}
int main (){
    cin >> n >> Vmax >> V2;
    for (int i = 1; i <= n; i++){
        char c;
        cin >> c >> t[i];
        a[i] = ((c == '+') ? 1 : -1);
        if (i != 1) dif.pb(t[i] - t[i - 1]);
    }
    if (ok(INF, 0)) return cout << "infinity\n", 0;
    sort(dif.begin(), dif.end());
    for (int x : dif){
        if (ok(x, 0)){
            ansT = x; ansV1 = ok(x, 1);
        }
    }
    cout << ansT << ' ' << ansV1 << '\n';
    /*if (ok(INF, 0)) return cout << "infinity\n", 0;
    int l = 0, r = INF;
    while (l + 1 < r){
        int mid = (l + r) / 2;
        if (ok(mid, 0)) l = mid;
        else r = mid;
    }
    cout << l << ' ' << ok(l, 1) << '\n';*/
    return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10