Submission #620173

#	Time	Username	Problem	Language	Result	Execution time	Memory
620173		stevancv	Examination (JOI19_examination)	C++14	0 / 100	240 ms	17504 KiB

examination

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
#define smin(a, b) a = min(a, b)
#define smax(a, b) a = max(a, b)
using namespace std;
const int N = 6e5 + 2;
const int mod = 1e9 + 7;
struct fenwick {
    int bit[N];
    void Add(int x, int y) {
        for (; x < N; x += x & (-x)) bit[x] += y;
    }
    int Get(int x) {
        x -= 1;
        int ans = 0;
        for (; x > 0; x -= x & (-x)) ans += bit[x];
        return ans;
    }
}f1, f2;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n, q;
    cin >> n >> q;
    vector<array<int, 4>> all;
    vector<int> vals;
    for (int i = 0; i < n; i++) {
        int a, b;
        cin >> a >> b;
        all.push_back({a, b, a + b, -1});
        vals.push_back(a);
        vals.push_back(b);
        vals.push_back(a + b);
    }
    for (int i = 0; i < q; i++) {
        int a, b, c;
        cin >> a >> b >> c;
        smax(c, a + b);
        all.push_back({a, b, c, i});
        vals.push_back(a);
        vals.push_back(b);
        vals.push_back(c);
    }
    sort(all.begin(), all.end(), [&] (array<int, 4> i, array<int, 4> j) {
            if (i[2] != j[2]) return i[2] > j[2];
            return i[3] > j[3];
    });
    sort(vals.begin(), vals.end());
    vals.erase(unique(vals.begin(), vals.end()), vals.end());
    map<int, int> hsh;
    for (int i = 0; i < vals.size(); i++) hsh[vals[i]] = i + 1;
    vector<int> ans(q);
    int o = 0;
    for (auto u : all) {
        if (u[3] == -1) {
            f1.Add(hsh[u[0]], 1);
            f2.Add(hsh[u[1]], 1);
            o += 1;
        }
        else {
            ans[u[3]] = o - f1.Get(hsh[u[0]]) - f2.Get(hsh[u[1]]);
        }
    }
    for (int i = 0; i < q; i++) cout << ans[i] << en;
    return 0;
}

Compilation message (stderr)

examination.cpp: In function 'int main()':
examination.cpp:55:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |     for (int i = 0; i < vals.size(); i++) hsh[vals[i]] = i + 1;
      |                     ~~^~~~~~~~~~~~~

• Subtask 1: 0 / 2
• Subtask 2: 0 / 20
• Subtask 3: 0 / 21
• Subtask 4: 0 / 57