제출 #99522

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
99522		ae04071	Jakarta Skyscrapers (APIO15_skyscraper)	C++11	57 / 100	1081 ms	35632 KiB

skyscraper

#include <bits/stdc++.h>
#define fi first
#define se second
using namespace std;
using pii=pair<int,int>;

set<pair<pii,int>> dp;
priority_queue<pair<int,pii>, vector<pair<int,pii>>, greater<pair<int,pii>>> que;
int n,m;
vector<int> arr[30000];

inline int abs(int a) {return a<0 ? -a : a;}
void push_val(int a,int b,int c) {
    if(a+b<0 || a+b>=n) return;

    pii idx = pii(a+b, abs(b));
    auto it = dp.lower_bound({idx,0});
    if(it==dp.end() || it->first!=idx) {
        dp.insert({idx,c});
        que.push({c,idx});
    } else if(it->second > c) {
        dp.erase(it);
        dp.insert({idx, c});
        que.push({c,idx});
    }
}
int main() {
    int ei;
    scanf("%d%d",&n,&m);
    for(int i=0,a,b;i<m;i++) {
        scanf("%d%d",&a,&b);
        arr[a].push_back(b);
        if(i==0) {
            dp.insert({{a,0},0});
            que.push({0,{a,0}});
        } else if(i==1) {
            ei = a;
        }
    }

    while(!que.empty()) {
        int cost=que.top().fi, pos=que.top().se.fi, pv=que.top().se.se;
        que.pop();
        
        push_val(pos,-pv,cost+1);
        push_val(pos,pv,cost+1);
        while(!arr[pos].empty()) {
            int pp=arr[pos].back();arr[pos].pop_back();
            push_val(pos-pp,pp,cost);
        }
    }

    int mx = -1;
    for(auto &v : dp) if(v.fi.fi==ei) {
        if(mx==-1 || mx > v.se) mx = v.se;
    }
    printf("%d\n",mx);
    
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:29:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
     ~~~~~^~~~~~~~~~~~~~
skyscraper.cpp:31:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&a,&b);
         ~~~~~^~~~~~~~~~~~~~
skyscraper.cpp:54:23: warning: 'ei' may be used uninitialized in this function [-Wmaybe-uninitialized]
     for(auto &v : dp) if(v.fi.fi==ei) {
                       ^~

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