Submission #1364301

#	Time	Username	Problem	Language	Result	Execution time	Memory
1364301		mannshah1211	Triple Peaks (IOI25_triples)	C++20	11 / 100	59 ms	16040 KiB

triples

#include "triples.h"
#include <bits/stdc++.h>

using namespace std;

long long count_triples(vector<int> h) {
  int n = h.size();
  auto In = [&](int i) {
    return (0 <= i) && (i < n);
  };
  long long ans = 0;
  for (int i = 0; i < n; i++) {
    int k = h[i] + i;
    if (In(k)) {
      int case1j = h[k] + i, case2j = k - h[k];
      if (In(case1j) && h[case1j] == k - case1j) {
        ans++;
      }
      if (In(case2j) && h[case2j] == case2j - i && case1j != case2j) {
        ans++;
      }
    }
  }
  for (int k = n - 1; k >= 0; k--) {
    int i = k - h[k];
    if (In(i)) {
      int case1j = h[i] + i, case2j = k - h[i];
      if (In(case1j) && h[case1j] == k - case1j) {
        ans++;
      }
      if (In(case2j) && h[case2j] == case2j - i && case1j != case2j) {
        ans++;
      }
    }
  }
  map<int, int> mp;
  for (int j = 0; j < n; j++) {
    if (mp[h[j]] != 0) {
      int i = mp[h[j]] - 1, k = h[j] + i;
      if (In(k) && k - h[k] == j) {
        ans++;
      }
    }
    mp[h[j] + j] = j + 1;
  }
  return ans;
}

vector<int> construct_range(int m, int k) {
  
}

Compilation message (stderr)

triples.cpp: In function 'std::vector<int> construct_range(int, int)':
triples.cpp:51:1: warning: no return statement in function returning non-void [-Wreturn-type]
   51 | }
      | ^

• Subtask 0: 0 / 0
• Subtask 1: 0 / 8
• Subtask 2: 0 / 6
• Subtask 3: 0 / 10
• Subtask 4: 11 / 11
• Subtask 5: 0 / 16
• Subtask 6: 0 / 19
• Subtask 7: 0 / 5
• Subtask 8: 0 / 5
• Subtask 9: 0 / 5
• Subtask 10: 0 / 5
• Subtask 11: 0 / 5
• Subtask 12: 0 / 5