제출 #769288

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
769288		Ahmed57	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	128 ms	262144 KiB

skyscraper

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

컴파일 시 표준 에러 (stderr) 메시지

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:60:22: warning: 'z' may be used uninitialized in this function [-Wmaybe-uninitialized]
   60 |     long long val = d(z);
      |                     ~^~~

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