比赛 EYOI暨SBOI暑假快乐赛3rd 评测结果 AWWAWTTTTTTTTTTTTTTT
题目名称 Convoluted Intervals 最终得分 10
用户昵称 cb 运行时间 46.196 s
代码语言 C++ 内存使用 0.00 MiB
提交时间 2022-06-27 10:15:52
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#include <bits/stdc++.h>
#define ll long long
using namespace std;
ll n, m, ans[10005] = {0}, c[10005] = {0};
int a[200005], b[200005];

int lowbit (int x) {
    return (x & -x);
}

void add (int x, int y) {
    for (; x <= (m << 1); x += lowbit (x)) {
        c[x] += y;
    }
    return ;
}

ll ask (int x) {
    ll ans = 0;
    for (; x; x -= lowbit (x)) {
        ans += c[x];
    }
    return ans;
}

int main () {
    freopen ("Convoluted_Intervals.in", "r", stdin);
    freopen ("Convoluted_Intervals.out", "w", stdout);
    scanf ("%d %d", &n, &m);
    for (int q = 1; q <= n; ++q) {
        scanf ("%d %d", &a[q], &b[q]);
        for (int w = 1; w <= q; ++w) {
            int aa, bb;
            aa = a[q] + a[w]; bb = b[q] + b[w];
            aa ++; bb ++;
            if (q == w) {
                add (aa, 1); add (bb + 1, -1);
            }
            else {
                add (aa, 2); add (bb + 1, -2);
            }
        }
    }
    for (int q = 1; q <= (m << 1) + 1; ++ q) {
        printf ("%lld\n", ask (q));
    }
    return 0;
}