제출 #154251

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
154251		karma	Worst Reporter 3 (JOI18_worst_reporter3)	C++14	100 / 100	624 ms	23464 KiB

worst_reporter3

#include<bits/stdc++.h>
#define Task     "test"
#define ll       long long
#define pb       emplace_back

using namespace std;

const int N = int(5e5) + 5;

int n, q, a[N], t, l, r, low, high, mid, ans;

bool Check(int x, bool type) {
    int pos = (t / a[x]) * a[x] - x - 1;
    if(type) return pos <= r;
    return pos >= l;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    if(fopen(Task".inp", "r")) {
        freopen(Task".inp", "r", stdin);
        freopen(Task".out", "w", stdout);
    }
    cin >> n >> q;
    for(int i = 0; i < n; ++i) {
        cin >> a[i];
        if(i) a[i] = ((a[i] - 1) / a[i - 1] + 1) * a[i - 1];
    }
    while(q --) {
        cin >> t >> l >> r;
        if(t >= l && t <= r) ans = 1;
        else ans = 0;
        low = 0, high = n - 1;
        while(low <= high) {
            mid = (low + high) >> 1;
            if(Check(mid, 0)) low = mid + 1;
            else high = mid - 1;
        }
        if(high < 0) {cout << ans << "\n"; continue;}
        ans += low, low = 0, high = n - 1;
        while(low <= high) {
            mid = (low + high) >> 1;
            if(Check(mid, 1)) high = mid - 1;
            else low = mid + 1;
        }
        cout << ans - low << '\n';
    }
}

컴파일 시 표준 에러 (stderr) 메시지

worst_reporter3.cpp: In function 'int main()':
worst_reporter3.cpp:22:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
         freopen(Task".inp", "r", stdin);
         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
worst_reporter3.cpp:23:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
         freopen(Task".out", "w", stdout);
         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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