Submission #1261881

#	Time	Username	Problem	Language	Result	Execution time	Memory
1261881		Canuc80k	Triple Peaks (IOI25_triples)	C++20	0 / 100	14 ms	1860 KiB

triples

#include "bits/stdc++.h"
using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;

map<ll, ll> pp[11];
long long count_triples(std::vector<int> H) {
    ll res = 0;

    // #TH: a[k] max
    for (int k = 2; k < H.size(); k ++) {
        bool ok1 = 1, ok2 = 1;

        int i = k - H[k];
        if (i < 0) continue;
        if (H[i] >= H[k]) continue;

        int j = k - H[i];
        if (j < 0) ok1 = 0;
        if (H[j] < H[i] || H[j] > H[k] || H[j] != j - i) ok1 = 0;
        if (H[j] > H[k]) ok1 = 0;
        if (H[j] != j - i) ok1 = 0;

        j = i + H[i];
        // cout << "Debug: " << i << ' ' << j << ' ' << k << endl;
        if (j < 0) ok2 = 0;
        if (H[j] < H[i]) ok2 = 0;
        if (H[j] > H[k]) ok2 = 0;
        if (H[j] != k - j) ok2 = 0;
        if (ok1) res ++;
        if (ok2) res ++;
    }
    return res;
}

std::vector<int> construct_range(int M, int K) {
    // vector<int> res; res.push_back(1);
    // for (int i = 1; i < M; i ++) res.push_back(i);
    // return res;
}

Compilation message (stderr)

triples.cpp: In function 'std::vector<int> construct_range(int, int)':
triples.cpp:41:1: warning: no return statement in function returning non-void [-Wreturn-type]
   41 | }
      | ^

• Subtask 0: 0 / 0
• Subtask 1: 0 / 8
• Subtask 2: 0 / 6
• Subtask 3: 0 / 10
• Subtask 4: 0 / 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