제출 #1288057

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1288057		nikoloz-ch	Triple Peaks (IOI25_triples)	C++20	24.34 / 100	586 ms	18552 KiB

triples

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

long long count_triples(std::vector<int> H){
    int N = H.size(), ans = 0;
    if(N <= 5000){
        map<int,vector<int>> mp;
        for(int i = 0; i < N; i++){
            mp[i-H[i]].push_back(i);
        }
        for(int i = 0; i < N; i++){
            for(int j = i+1; j < N; j++){
                const int k = j-i;
                if(k != H[i] and k != H[j]){
                    if(k != abs(H[i]-H[j])) continue;
                    const int p = j+min(H[i],H[j]);
                    if(p >= N or H[p] != k or p <= j) continue;
                    ans++;
                    continue;
                }
                if(k == H[i]){
                    for(auto &t : mp[i]){
                        if(t <= j) continue;
                        if(t-j != H[j]) continue;
                        ans++;
                    }
                    for(auto &t : mp[j]){
                        if(t <= j) continue;
                        if(t-i != H[j]) continue;
                        ans++;
                    }
                    continue;
                }
                for(auto &t : mp[i]){
                    if(t <= j) continue;
                    if(abs(t-j) != H[i]) continue;
                    ans++;
                }
                for(auto &t : mp[j]){
                    if(t <= j) continue;
                    if(abs(t-i) != H[i]) continue;
                    ans++;
                }
                continue;
            }
        }
        return ans;
    }
    for(int i = 0; i < N-10; i++){
        vector<int> a;
        for(int j = i; j <= i+10; j++){
            a.push_back(H[j]);
        }
        ans += count_triples(a);
        a.pop_back();
        ans -= (i > 0 ? count_triples(a) : 0);
    }
    return ans;
}


std::vector<int> construct_range(int M, int K){
    vector<int> a;
    for(int i = 0; i < M; i++){
        int p = rand() % M;
        a.push_back((p == 0 ? 1 : p));
    }
    return a;
}

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