Submission #158238

#	Time	Username	Problem	Language	Result	Execution time	Memory
158238		Akashi	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	1083 ms	71104 KiB

skyscraper

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

struct usu{
    int x, y, l;
};

int sgn[] = {-1, 1};
int n, m;
vector <int> v[30005];
queue <usu> q;
unordered_map <int, int> d[30005];

void f(int x, int y, int l){
    for(int k = 0; k <= 1 ; ++k){
        int nx = x + y * sgn[k];
        if(nx < 0 || nx > n) continue ;
        if(d[nx][y] == 0){
            d[nx][y] = l + 1;
            q.push({nx, y, l + 1});
        }
    }
}

int main()
{
    scanf("%d%d", &n, &m);

    int x, y, pos;
    scanf("%d%d", &x, &y);
    d[x][y] = 1;
    q.push({x, y, 1});

    scanf("%d%d", &x, &y);
    v[x].push_back(y);
    pos = x;
    for(int i = 3; i <= m ; ++i){
        scanf("%d%d", &x, &y);
        v[x].push_back(y);
    }

    while(!q.empty()){
        int x = q.front().x, y = q.front().y, l = q.front().l;
        if(x == pos){
            printf("%d", l - 1);
            return 0;
        }
        q.pop();

        f(x, y, l);
        for(auto it : v[x]) f(x, it, l);
    }

    printf("-1");
    return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:27:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~
skyscraper.cpp:30:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &x, &y);
     ~~~~~^~~~~~~~~~~~~~~~
skyscraper.cpp:34:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &x, &y);
     ~~~~~^~~~~~~~~~~~~~~~
skyscraper.cpp:38:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &x, &y);
         ~~~~~^~~~~~~~~~~~~~~~

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