Submission #394256

#	Time	Username	Problem	Language	Result	Execution time	Memory
394256		retsiger	Examination (JOI19_examination)	C++14	100 / 100	527 ms	22352 KiB

examination

#include<bits/stdc++.h>
#define bug(x) cerr<<#x<<" = "<<x<<'\n'

using namespace std;

const int maxn = 1e5;

int N, Q, S[maxn], T[maxn], x, A[maxn], B[maxn], C[maxn], Ans[maxn];
vector <int> vs, vt[maxn + 1], ft[maxn + 1];
array<int, 2> D[maxn], E[maxn];

int main() {
//  freopen("cc.inp", "r", stdin);
//  freopen("cc.out", "w", stdout);
  ios::sync_with_stdio(0); cin.tie(0);
  cin >> N >> Q;
  for (int i = 0; i < N; ++i) {
    cin >> S[i] >> T[i];
    S[i] = -S[i]; T[i] = -T[i];
    vs.push_back(S[i]);
    D[i] = {S[i] + T[i], i};
  }
  sort(vs.begin(), vs.end());
  vs.resize(x = unique(vs.begin(), vs.end()) - vs.begin());
  for (int i = 0; i < N; ++i) {
    S[i] = lower_bound(vs.begin(), vs.end(), S[i]) - vs.begin();
    for (int j = S[i] + 1; j <= x; j += j & -j)
      vt[j].push_back(T[i]);
  }
  for (int i = 1; i <= x; ++i) {
    sort(vt[i].begin(), vt[i].end());
    vt[i].resize(unique(vt[i].begin(), vt[i].end()) - vt[i].begin());
    ft[i].resize(vt[i].size() + 1);
  }
  sort(D, D + N);
  for (int i = 0; i < Q; ++i) {
    cin >> A[i] >> B[i] >> C[i];
    A[i] = -A[i];
    B[i] = -B[i];
    C[i] = -C[i];
    E[i] = {C[i], i};
  }
  sort(E, E + Q);
  for (int i1 = 0, i2 = 0; i1 < Q; ++i1) {
    while (i2 < N && D[i2][0] <= E[i1][0]) {
      for (int i = S[D[i2][1]] + 1; i <= x; i += i & -i)
        for (int j = lower_bound(vt[i].begin(), vt[i].end(), T[D[i2][1]]) - vt[i].begin() + 1; j <= vt[i].size(); j += j & -j)
          ft[i][j]++;
      ++i2;
    }
    for (int i = upper_bound(vs.begin(), vs.end(), A[E[i1][1]]) - vs.begin(); i; i -= i & -i) {
      for (int j = upper_bound(vt[i].begin(), vt[i].end(), B[E[i1][1]]) - vt[i].begin(); j; j -= j & -j)
        Ans[E[i1][1]] += ft[i][j];
    }
  }
  for (int i = 0; i < Q; ++i)
    cout << Ans[i] << '\n';
}

Compilation message (stderr)

examination.cpp: In function 'int main()':
examination.cpp:47:98: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |         for (int j = lower_bound(vt[i].begin(), vt[i].end(), T[D[i2][1]]) - vt[i].begin() + 1; j <= vt[i].size(); j += j & -j)
      |                                                                                                ~~^~~~~~~~~~~~~~~

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