Submission #1251911

#	Time	Username	Problem	Language	Result	Execution time	Memory
1251911		Semicolon	Triple Peaks (IOI25_triples)	C++20	Compilation error	0 ms	0 KiB

triples

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

ll count_triples(const vector<int>& H) {
    int N = H.size();
    ll ans = 0;
    // Permutation 1: (H[i], H[j], H[k]) = (d(i,j), d(j,k), d(i,k))
    //   j = i + H[i];  k = j + H[j];  check H[k] == H[i] + H[j]
    for (int i = 0; i < N; i++) {
        int j = i + H[i];
        if (j < N) {
            int k = j + H[j];
            if (k < N && H[k] == H[i] + H[j]) 
                ans++;
        }
    }
    // Permutation 2: (H[i],H[j],H[k]) = (d(i,j), d(i,k), d(j,k))
    //   j = i + H[i];  k = i + H[j];  check H[k] == H[j] - H[i]
    for (int i = 0; i < N; i++) {
        int j = i + H[i];
        if (j < N) {
            int k = i + H[j];
            if (k < N && H[k] == H[j] - H[i]) 
                ans++;
        }
    }
    // Permutation 3: (H[i],H[j],H[k]) = (d(j,k), d(i,j), d(i,k))
    //   i = j - H[j];  k = j + H[i];  check H[k] == H[i] + H[j]
    for (int j = 0; j < N; j++) {
        int i = j - H[j];
        if (i >= 0) {
            int k = j + H[i];
            if (k < N && H[k] == H[i] + H[j]) 
                ans++;
        }
    }
    // Permutation 4: (H[i],H[j],H[k]) = (d(j,k), d(i,k), d(i,j))
    //   i = j - H[j];  k = i + H[j];  check H[i] == H[j] + H[k]
    for (int j = 0; j < N; j++) {
        int i = j - H[j];
        if (i >= 0) {
            int k = i + H[j];
            if (k < N && H[i] == H[j] + H[k]) 
                ans++;
        }
    }
    // Permutation 5: (H[i],H[j],H[k]) = (d(i,k), d(i,j), d(j,k))
    //   k = i + H[i];  j = i + H[k];  check H[j] == H[i] + H[k]
    for (int i = 0; i < N; i++) {
        int k = i + H[i];
        if (k < N) {
            int j = i + H[k];
            if (j < N && H[j] == H[i] + H[k]) 
                ans++;
        }
    }
    // Permutation 6: (H[i],H[j],H[k]) = (d(i,k), d(j,k), d(i,j))
    //   k = i + H[i];  j = k - H[j];  check H[i] == H[j] + H[k]
    for (int i = 0; i < N; i++) {
        int k = i + H[i];
        if (k < N) {
            int j = k - H[k];
            if (j > i && j < N && H[i] == H[j] + H[k]) 
                ans++;
        }
    }
    return ans;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int t;
    if (!(cin >> t)) return 0;
    if (t == 1) {
        int N; 
        cin >> N;
        vector<int> H(N);
        for (int i = 0; i < N; i++) 
            cin >> H[i];
        cout << count_triples(H) << "\n";
    } else {
        // Phần II: bạn sẽ viết tương tự, chỉ khác là xuất ra dãy H
        //  theo chuẩn mà bài yêu cầu.
    }
    return 0;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/cc53LCDn.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cczM1os7.o:triples.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/cc53LCDn.o: in function `main':
grader.cpp:(.text.startup+0x18a): undefined reference to `construct_range(int, int)'
/usr/bin/ld: grader.cpp:(.text.startup+0x37b): undefined reference to `count_triples(std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status