Submission #119139

#	Time	Username	Problem	Language	Result	Execution time	Memory
119139		Charis02	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	100 / 100	819 ms	6512 KiB

skyscraper

#include<iostream>
#include<stdio.h>
#include<vector>
#include<cmath>
#include<queue>
#include<string.h>
#include<map>
#include<set>
#include<algorithm>
#define ll long long
#define pi pair < ll,ll >
#define mp(a,b) make_pair(a,b)
#define rep(i,a,b) for(int i = a;i < b;i++)
#define N 30004
#define INF 1e9+7

using namespace std;

ll pos[N],jump[N],n,m,d[N];
vector < vector < ll > > building(N);

int main()
{
    ios_base::sync_with_stdio(false);

    cin >> n >> m;

    rep(i,0,m)
    {
        cin >> pos[i] >> jump[i];

        building[pos[i]].push_back(jump[i]);
    }

    rep(i,0,n)
        d[i] = INF;

    priority_queue < pi > pq;
    pq.push(mp(0,pos[0]));
    d[pos[0]] = 0;

    while(!pq.empty())
    {
        pi cur = pq.top();
        pq.pop();

        if(-cur.first > d[cur.second])
            continue;

        rep(i,0,building[cur.second].size())
        {
            ll p = building[cur.second][i];

            ll j = -1;

            while(cur.second + p*j >= 0)
            {
                if(-cur.first - j < d[cur.second+p*j])
                {
                    d[cur.second+p*j] = -cur.first-j;
                    pq.push(mp(-d[cur.second+p*j],cur.second+p*j));
                }
                j--;
            }

            j = 0;

            while(cur.second + p*j < n)
            {
                if(-cur.first + j < d[cur.second+p*j])
                {
                    d[cur.second+p*j] = -cur.first+j;
                    pq.push(mp(-d[cur.second+p*j],cur.second+p*j));
                }
                j++;
            }
        }
    }

    if(d[pos[1]] != INF)
        cout << d[pos[1]] << endl;
    else
        cout << -1 << endl;
    return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:13:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define rep(i,a,b) for(int i = a;i < b;i++)
skyscraper.cpp:50:13:
         rep(i,0,building[cur.second].size())
             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:50:9: note: in expansion of macro 'rep'
         rep(i,0,building[cur.second].size())
         ^~~

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 14 / 14
• Subtask 4: 21 / 21
• Subtask 5: 43 / 43