Submission #31140

#	Time	Username	Problem	Language	Result	Execution time	Memory
31140		nibnalin	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	36 / 100	1000 ms	3564 KiB

skyscraper

#include <iostream>
#include <cstdio>
#include <vector>
#include <set>
#include <cmath>
using namespace std;

const int inf = int(1e9)+5, maxn = int(3e4)+5;

int B[maxn], P[maxn], D[maxn];

int dist(int x, int y)
{
    int ret = abs(B[x]-B[y]);
    if(ret%P[x] == 0) return ret/P[x];
    else return inf;
}

int main(void)
{
    int n, m;
    scanf("%d%d", &n, &m);
    for(int i = 0;i < m;i++) scanf("%d%d", &B[i], &P[i]), D[i] = inf;

    set<pair<int, int>> Q;
    D[0] = 0;
    Q.insert({0, 0});

    while(!Q.empty())
    {
        pair<int, int> top = *Q.begin();
        Q.erase(Q.begin());
        //cout << top.second << "\n";

        for(int i = 0;i < m;i++)
        {
            if(i == top.second) continue;

            int c = dist(top.second, i);
            if(top.first+c < D[i])
            {
                if(D[i] != inf) Q.erase({D[i], i});
                D[i] = top.first+c;
                Q.insert({D[i], i});
            }
        }
    }

    printf("%d\n", (D[1] >= inf)?-1:D[1]);
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:22:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
                          ^
skyscraper.cpp:23:69: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i = 0;i < m;i++) scanf("%d%d", &B[i], &P[i]), D[i] = inf;
                                                                     ^

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