Submission #774909

#	Time	Username	Problem	Language	Result	Execution time	Memory
774909		SteGG	Worst Reporter 3 (JOI18_worst_reporter3)	C++17	12 / 100	21 ms	2260 KiB

worst_reporter3

#include <bits/stdc++.h>
#define int long long

using namespace std;
const int maxn = 1e5 + 5;

int n, q;
int f[maxn];
int d[maxn];

void open(){
    if(fopen("input.inp", "r")){
        freopen("input.inp", "r", stdin);
    }
}

signed main(){
    open();
    cin >> n >> q;
    for(int i = 1; i <= n; i++){
        cin >> d[i];
    }

    f[0] = 1;
    for(int i = 1; i <= n; i++){
        f[i] = ceil((double)(d[i]) / (double)(f[i - 1])) * f[i - 1];
    }

    auto get = [&](int pos, int t){
        return t / f[pos] * f[pos] - pos;
    };

    auto bin_sex = [&](int limit, int t){
        int s = 0, e = n;
        int ans = -1;
        while(s <= e){
            int mid = (s + e) >> 1;
            int pos = get(mid, t);
            // cout << t << " " << mid << " " << pos << endl;
            if(pos >= limit){
                s = mid + 1;
                ans = mid;
            }else{
                e = mid - 1;
            }
        }
        return ans + 1;
    };

    while(q--){
        int t, l, r;
        cin >> t >> l >> r;
        if(t <= l){
            cout << (t == l) << endl;
        }else{
            cout << bin_sex(l, t) - bin_sex(r + 1, t) << endl;
        }
    }

    return 0;
}

Compilation message (stderr)

worst_reporter3.cpp: In function 'void open()':
worst_reporter3.cpp:13:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |         freopen("input.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 12 / 12
• Subtask 3: 0 / 81