Submission #502960

#TimeUsernameProblemLanguageResultExecution timeMemory
502960MardukXylophone (JOI18_xylophone)C++14
100 / 100
97 ms576 KiB
#include <bits/stdc++.h>
#include "xylophone.h"
using namespace std;

const int MAXN = (1e4+7);

bool arr[MAXN];
int memo_d[MAXN], memo_t[MAXN];
int sol[MAXN];

int D(int x){
    if(memo_d[x]) return memo_d[x];
    return memo_d[x] = query(x, x+1);
}

int T(int x){
    if(memo_t[x]) return memo_t[x];
    return memo_t[x] = query(x, x+2);
}

void solve(int N){
    arr[2] = true;
    for(int i = 1;i<=N-2;i++){
        if(D(i)+D(i+1) == T(i)) arr[i+2] = arr[i+1];
        else arr[i+2] = !arr[i+1];
    }

    for(int i = 0;i<2;i++){
        int MIN = sol[1];
        for(int i = 2;i<=N;i++){
            sol[i] = sol[i-1] + (arr[i]%2-(arr[i]+1)%2)*D(i-1);
            MIN = min(MIN,sol[i]);
            arr[i] = !arr[i];
        }

        bool found = 0;
        for(int i = 1;i<=N;i++){
            if(sol[i]+(1-MIN) == 1) break;
            if(sol[i]+(1-MIN) == N) {found = 1; break;}
        }

        if(!found){
            for(int i = 1;i<=N;i++) answer(i,sol[i]+(1-MIN));
            return;
        }
    }
}
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