제출 #902788

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
902788		VinhLuu	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	0 / 100	1 ms	4704 KiB

skyscraper

// happy

//#pragma GCC optimize("O3,unroll-loops")
//#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

#include <bits/stdc++.h>
#define int long long
//#define ll long long
#define fi first
#define se second
#define pb push_back
using namespace std;

typedef pair<int,int> pii;
typedef tuple<int,int,int> tp;
const int N = 1e5 + 5;
const int oo = 1e15;
const int mod = 1e9 + 7;
const int base = 29; // >= so pt pb max

struct e{
    int b, p;
} T[N];

bool comp(e g1, e g2){
    return g1.b < g2.b;
}

int n, m, b[N], p[N], dp[N];
vector<int> v[N];

void dij(){
    for(int i = 1; i <= m; i ++) dp[i] = oo;
    priority_queue<pii, vector<pii>, greater<pii>> pq;
    dp[1] = 0;
    pq.push({0, 1});
    while(!pq.empty()){
        int w = pq.top().fi;
        int i = pq.top().se;
        pq.pop();
        if(w > dp[i]) continue;

//        cout << w << " " << i << " g\n";

        if(i == 2){
            cout << dp[i];
            return;
        }

        if(!p[i]) continue;

        for(int j = 1; i + j * p[i] <= m || i - j * p[i] >= 1; j ++){
            int tmp = i + j * p[i];
            if(tmp <= m && dp[tmp] > dp[i] + j){
              pq.push({dp[tmp] = dp[i] + j, tmp});
            }
            tmp = i - j * p[i];
            if(tmp >= 1 && dp[tmp] > dp[i] + j) pq.push({dp[tmp] = dp[i] + j, tmp});
        }
    }
    cout << -1;
}

signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    #define task "v"
    if(fopen(task ".inp","r")){
        freopen(task ".inp","r",stdin);
        freopen(task ".out","w",stdout);
    }

    cin >> m >> n;
    for(int i = 1; i <= n; i ++){
        cin >> T[i].b >> T[i].p;
        T[i].b++;
        p[T[i].b] = T[i].p;
//        cout << T[i].b << " " << T[i].p << "h\n";
    }
    sort(T + 1, T + n + 1, comp);

    dij();
}

컴파일 시 표준 에러 (stderr) 메시지

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:70:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |         freopen(task ".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:71:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |         freopen(task ".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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