Submission #1251349

#	Time	Username	Problem	Language	Result	Execution time	Memory
1251349		tranvinhhuy2010	Triple Peaks (IOI25_triples)	C++20	Compilation error	0 ms	0 KiB

triples

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

using namespace std;

typedef long long ll;

const int nmax = 2e5 + 5;
int n;
unordered_map <int, vector <int>> mk;

ll count_triples(vector <int> H) {
    n = H.size();
    ll cnt = 0;
    for (int j=0; j<n; j++) {
        // Hj = j - i
        int i = j - H[j];
        if (i>=0) {
            int k1 = i + H[i], k2 = j + H[i];
            if (k1<n && k1>j && H[k1]==k1-j) cnt++;
            if (k2<n && k2>j && H[k2]==k2-i) cnt++;
        }

        // Hj = k - j
        int k = j + H[j];
        if (k<n) {
            int i1 = j - H[k], i2 = k - H[k];
            if (i1>=0 && i1<j && H[i1]==k-i1) cnt++;
            if (i2>=0 && i2<j && H[i2]==j-i2) cnt++;
        }

        mk[j - H[j]].push_back(j);
    }

    for (int i=0; i<n; i++) {
        int j = i + H[i];
        if (j<=n) {
            int k = i + H[j];
            if (H[k]==k-j) cnt++;
        }
    }

    for (int i=0; i<n; i++) {
        mk[i - H[i]].erase(remove(mk[i - H[i]].begin(), mk[i - H[i]].end(), i), mk[i - H[i]].end());

        for (int k : mk[i + H[i]]) {
            int j = H[i] + H[k];
            if (j==k-i) cnt++;
        }
    }

    return cnt;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/cctNzgUT.o: in function `main':
grader.cpp:(.text.startup+0x18a): undefined reference to `construct_range(int, int)'
collect2: error: ld returned 1 exit status