Submission #22003

#	Time	Username	Problem	Language	Result	Execution time	Memory
22003		mohammad_kilani	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	0 / 100	0 ms	21572 KiB

skyscraper

#include<bits/stdc++.h>
using namespace std;
const int N = 2001;
bool vis[N][N];
int cost[N][N];
int n,m;
vector<vector<int> > g;

int BFS(int s,int e){
    queue<pair<int,int> > q;
    q.push(make_pair(s,g[s][0]));
    vis[s][g[s][0]] = true;
    while(!q.empty()){
        int node = q.front().first;
        int jump = q.front().second;
        q.pop();
        if(node == e)
            return cost[node][jump];
        if(node-jump >= 0 && !vis[node-jump][jump]){
            vis[node-jump][jump] = true;
            cost[node-jump][jump] = cost[node][jump] + 1;
            q.push(make_pair(node-jump,jump));
        }
        if(node+jump < n && !vis[node+jump][jump]){
            vis[node+jump][jump] = true;
            cost[node+jump][jump] = cost[node][jump] + 1;
            q.push(make_pair(node+jump,jump));
        }
        int si = g[node].size();
        for(int i=0;i<si;i++){
            int newjump = g[node][i];
            if(node-newjump >= 0 && !vis[node-newjump][newjump]){
                vis[node-newjump][newjump] = true;
                cost[node-newjump][newjump] = cost[node][jump] + 1;
                q.push(make_pair(node-newjump,newjump));
            }
            if(node+newjump < n && !vis[node+newjump][newjump]){
                vis[node+newjump][newjump] = true;
                cost[node+newjump][newjump] = cost[node][jump] + 1;
                q.push(make_pair(node+newjump,newjump));
            }

        }
    }
    return 0;
}

int main(){
    //freopen("in.txt","r",stdin);
    scanf("%d%d",&n,&m);
    g.resize(n+2);
    int s,e;
    for(int i=0;i<m;i++){
        int b,p;
        scanf("%d%d",&b,&p);
        g[b].push_back(p);
        if(i == 0){
            s = b;
        }
        if(i == 1)
            e = b;
    }
    cout << BFS(s,e);
    return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:50:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
                        ^
skyscraper.cpp:55:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&b,&p);
                            ^
skyscraper.cpp:63:20: warning: 'e' may be used uninitialized in this function [-Wmaybe-uninitialized]
     cout << BFS(s,e);
                    ^
skyscraper.cpp:63:20: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]

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