Submission #548589

#	Time	Username	Problem	Language	Result	Execution time	Memory
548589		beaconmc	Xylophone (JOI18_xylophone)	C++14	100 / 100	92 ms	360 KiB

xylophone

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

typedef long long ll;
using namespace std;

#define FOR(i, x, y) for(ll i=x; i<y; i++)
#define FORNEG(i, x, y) for(ll i=x; i>y; i--)
#define fast() ios_base::sync_with_stdio(false);cin.tie(NULL)
#define ll int
ll twodiff[5001];
ll threediff[5001];



ll max(ll x[5001]){
    ll maxi = -1000000;
    FOR(i,0,5002){
        if (x[i]!=0){
            maxi = max(maxi, x[i]);
        }
    }

    return maxi;
}
ll min(ll x[5001]){
    ll mini = 1000000;
    FOR(i,0,5002){
        if (x[i]!=0){
            mini = min(mini, x[i]);
        }
    }
    return mini;
}

void solve(ll n){
    ll sussy[5001];
    FOR(i,0,5001){
        twodiff[i] = 0;
        threediff[i] = 0;
        sussy[i] = 0;
    }
    FOR(i,1,n){
        twodiff[i] = query(i, i+1);
    }
    FOR(i,1,n-1){
        threediff[i] = query(i, i+2);
    }


    FOR(i,2,n){
        if (threediff[i-1] == abs(twodiff[i-1]) + abs(twodiff[i])){
            twodiff[i] *= twodiff[i-1] / abs(twodiff[i-1]);
        }else{
            twodiff[i] *= -1*(twodiff[i-1] / abs(twodiff[i-1]));
        }
    }


    sussy[1] = twodiff[1];

    FOR(i,2,n){
        sussy[i] = sussy[i-1] + twodiff[i];
    }
    ll sus = min(sussy);
    if (sus>0) sus=0;
    ll amog, us;
    FOR(i,0,n){
        sussy[i] -= sus-1;
        if (sussy[i] == 1){
            amog = i;
        }
        if (sussy[i] == n) us = i;
    }
    if (amog > us){
        sussy[0] = 0;
        FOR(i,1,n) twodiff[i] *= -1;
        sussy[1] = twodiff[1];
        FOR(i,2,n){
            sussy[i] = sussy[i-1] + twodiff[i];
        }
        ll sus = min(sussy);
        if (sus>0) sus=0;

        FOR(i,0,n){
            sussy[i] -= sus-1;
        }

    }


    FOR(i,0,n){
        answer(i+1, sussy[i]);
    }
}

Compilation message (stderr)

xylophone.cpp: In function 'void solve(int)':
xylophone.cpp:75:5: warning: 'amog' may be used uninitialized in this function [-Wmaybe-uninitialized]
   75 |     if (amog > us){
      |     ^~
xylophone.cpp:75:5: warning: 'us' may be used uninitialized in this function [-Wmaybe-uninitialized]

• Subtask 1: 11 / 11
• Subtask 2: 36 / 36
• Subtask 3: 53 / 53