Submission #105989

#	Time	Username	Problem	Language	Result	Execution time	Memory
105989		Hideo	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	10 / 100	1071 ms	37240 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pb push_back
#define mk make_pair
#define fr first
#define sc second
#define vi vector < int >
#define vl vector < ll >
#define pi pair < int, int >
#define pii pair < int, pi >
#define vii vector < pi >

const int N = 2e5 + 7;
const int INF = 1e9 + 7;

int l[N], p[N], us[N];
int n, m, ans;

vii g[N];

void dfs (int v = 1, int c = 0){
    if (c >= us[v])
        return;
    us[v] = c;
    if (v == 2){
        ans = min(ans, c);
        return;
    }
    for (pi to : g[v])
        dfs(to.fr, c + to.sc);
}

main(){
    ans = INF;
    cin >> n >> m;
    for (int i = 1; i <= m; i++){
        us[i] = INF;
        scanf("%d%d", &l[i], &p[i]);
    }
    for (int i = 1; i <= m; i++)
        for (int j = 1; j <= m; j++)
            if (i != j && l[i] % p[i] == l[j] % p[i])
                g[i].pb(mk(j, abs(l[j] - l[i]) / p[i]));
    dfs();
    if (ans == INF)
        cout << -1;
    else
        cout << ans;
}

Compilation message (stderr)

skyscraper.cpp:35:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:40:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &l[i], &p[i]);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~

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