Submission #678597

#	Time	Username	Problem	Language	Result	Execution time	Memory
678597		qwerasdfzxcl	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	1087 ms	2088 KiB

skyscraper

#include <bits/stdc++.h>

typedef long long ll;
using namespace std;
constexpr int INF = 1e9+100;
int dist[30030], visited[30030];
vector<int> a[30030];

int main(){
    int n, m, s, e;
    scanf("%d %d", &n, &m);
    for (int i=1;i<=m;i++){
        int x, p;
        scanf("%d %d", &x, &p);
        ++x;

        a[x].push_back(p);

        if (i==1) s = x;
        if (i==2) e = x;
    }

    fill(dist+1, dist+n+1, INF);
    fill(visited+1, visited+n+1, 0);
    dist[s] = 0;
    for (int i=1;i<=n;i++){
        sort(a[i].begin(), a[i].end());
        a[i].erase(unique(a[i].begin(), a[i].end()), a[i].end());
    }

    for (int z=1;z<=n;z++){
        int mn = INF, idx = -1;
        for (int i=1;i<=n;i++) if (!visited[i] && mn > dist[i]){
            mn = dist[i];
            idx = i;
        }
        if (idx==-1) break;
        visited[idx] = 1;

        for (auto &p:a[idx]){
            for (int i=idx-p, j=1;i>0;i-=p, j++) dist[i] = min(dist[i], dist[idx] + j);
            for (int i=idx+p, j=1;i<=n;i+=p, j++) dist[i] = min(dist[i], dist[idx] + j);
        }
    }

    if (dist[e]==INF) printf("-1\n");
    else printf("%d\n", dist[e]);
    return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:11:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
skyscraper.cpp:14:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |         scanf("%d %d", &x, &p);
      |         ~~~~~^~~~~~~~~~~~~~~~~
skyscraper.cpp:46:15: warning: 'e' may be used uninitialized in this function [-Wmaybe-uninitialized]
   46 |     if (dist[e]==INF) printf("-1\n");
      |         ~~~~~~^
skyscraper.cpp:25:13: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
   25 |     dist[s] = 0;
      |     ~~~~~~~~^~~

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