제출 #320140

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
320140		Karen124	MP3 Player (CEOI10_mp3player)	C++14	0 / 100	80 ms	1272 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];
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, 1);
        V1 = min(V1, Vmax);
    }
    for (int i = 2; i <= n; i++){
        if (t[i] - t[i - 1] <= T){
            V1 += a[i];
        }
        V1 = max(V1, 1);
        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);
    }
    int v1 = V2;
    for (int i = n; i >= 1; i--){
        v1 -= a[i];
        v1 = max(v1, 1);
        v1 = min(v1, Vmax);
    }
    for (int i = 1; i <= n; i++){
        v1 += a[i];
        v1 = max(v1, 1);
        v1 = min(v1, Vmax);
    }
    if (v1 == V2) 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;
}

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