Submission #1037848

#	Time	Username	Problem	Language	Result	Execution time	Memory
1037848		KasymK	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	36 / 100	12 ms	604 KiB

skyscraper

#include "bits/stdc++.h"
using namespace std;
#define ff first
#define ss second
#define all(v) v.begin(), v.end()
#define ll long long
#define pb push_back
#define pii pair<int, int>
#define wr puts("----------------")
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
const int MOD = 1e9+7;
// const int INF = 1e9;
const int N = 2e3+5;
const ll INF = (ll)1e18;

int n, m;
int b[N], p[N];
ll dist[N];
priority_queue<pair<ll, int>> pq;

ll solve(){
	for(int i = 0; i < m; ++i)
		dist[i] = INF;
    dist[0] = 0;
    pq.push({0, 0});
    while (!pq.empty()){
        auto x = pq.top();
        pq.pop();
        if (-x.ff > dist[x.ss])
            continue;
        if (x.ss == 1)
            return -x.ff;
        for(int i = 0; i < m; ++i)
        	if (abs(b[x.ss]-b[i])%p[x.ss] == 0){
	            int w = abs(b[x.ss] - b[i])/p[x.ss];
	            if (dist[i] > dist[x.ss]+w){
	                dist[i] = dist[x.ss]+w;
	                pq.push({-dist[i], i});
	            }
        	}
    }
    return -1;
}

int main(){
	scanf("%d%d", &n, &m);
	for(int i = 0; i < m; ++i)
		scanf("%d%d", &b[i], &p[i]);
	ll answer = solve();
	printf("%lld\n", answer);
	return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:48:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |  scanf("%d%d", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~
skyscraper.cpp:50:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |   scanf("%d%d", &b[i], &p[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~

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