Submission #695221

#	Time	Username	Problem	Language	Result	Execution time	Memory
695221		Ahmed57	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	36 / 100	489 ms	262144 KiB

skyscraper

#include <bits/stdc++.h>
//#include "game.h"
using namespace std;
vector<int> ind[2001];
int len[30001];
int n,m;
int nah;
long long d(int b){
    long long cost[m][n];
    for(int i = 0;i<m;i++)for(int j = 0;j<n;j++)cost[i][j] = 1e18;
    priority_queue<pair<long long,pair<int,int>>> q1;
    q1.push({0,{0,b}});
    cost[0][b] = 0;
    while(!q1.empty()){
        long long co = q1.top().first*-1;
        long long dog = q1.top().second.first;
        long long indx = q1.top().second.second;
        q1.pop();
        if(co>cost[dog][indx]) continue ;
        for(auto i:ind[indx]){
            if(cost[i][indx]>(cost[dog][indx])){
                cost[i][indx] = (cost[dog][indx]);
                q1.push({cost[i][indx]*-1,{i,indx}});
            }
        }
        if(indx+len[dog]>=0&&indx+len[dog]<n){
            if(cost[dog][indx+len[dog]]>(cost[dog][indx]+1)){
               cost[dog][indx+len[dog]] = (cost[dog][indx]+1);
               q1.push({cost[dog][indx+len[dog]]*-1,{dog,indx+len[dog]}});
            }
        }
        if(indx-len[dog]>=0&&indx-len[dog]<n){
            if(cost[dog][indx-len[dog]]>(cost[dog][indx]+1)){
               cost[dog][indx-len[dog]] = (cost[dog][indx]+1);
               q1.push({cost[dog][indx-len[dog]]*-1,{dog,indx-len[dog]}});
            }
        }
    }
    return cost[1][nah];
}
int main(){
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    cin>>n>>m;
    long long z;
    for(int i = 0;i<m;i++){
        long long x,b;
        cin>>x>>b;
        if(i==1)nah = x;
        if(i==0)z = x;
        len[i] = b;
        ind[x].push_back(i);
    }
    //cout<<z<<" "<<nah<<"\n";
    long long val = d(z);
    if(val==1e18)cout<<-1<<"\n";
    else cout<<val<<"\n";
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:54:22: warning: 'z' may be used uninitialized in this function [-Wmaybe-uninitialized]
   54 |     long long val = d(z);
      |                     ~^~~

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 14 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43