Submission #446315

#	Time	Username	Problem	Language	Result	Execution time	Memory
446315		urd05	Building Skyscrapers (CEOI19_skyscrapers)	C++17	54 / 100	496 ms	23868 KiB

skyscrapers

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

typedef pair<int,int> P;
map<P,int> mp;
map<P,bool> vis;
set<P> s;
int dx[8]={1,1,0,-1,-1,-1,0,1};
int dy[8]={0,1,1,1,0,-1,-1,-1};

int main() {
    int n,t;
    scanf("%d %d",&n,&t);
    for(int i=0;i<n;i++) {
        int x,y;
        scanf("%d %d",&x,&y);
        mp[P(x,y)]=i;
    }
    P st=(*mp.begin()).first;
    vis[st]=true;
    vector<int> ret;
    s.insert(st);
    while (!s.empty()) {
        P now=*s.begin();
        s.erase(now);
        ret.push_back(mp[now]);
        int x=now.first;
        int y=now.second;
        for(int i=0;i<8;i++) {
            if (mp.find(P(x+dx[i],y+dy[i]))!=mp.end()&&!vis[P(x+dx[i],y+dy[i])]) {
                vis[P(x+dx[i],y+dy[i])]=true;
                s.insert(P(x+dx[i],y+dy[i]));
            }
        }
    }
    if (ret.size()!=n) {
        printf("NO");
    }
    else {
        printf("YES\n");
        for(int i=0;i<n;i++) {
            printf("%d\n",ret[i]+1);
        }
    }
}

Compilation message (stderr)

skyscrapers.cpp: In function 'int main()':
skyscrapers.cpp:36:19: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   36 |     if (ret.size()!=n) {
      |         ~~~~~~~~~~^~~
skyscrapers.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     scanf("%d %d",&n,&t);
      |     ~~~~~^~~~~~~~~~~~~~~
skyscrapers.cpp:16:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |         scanf("%d %d",&x,&y);
      |         ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 14 / 14
• Subtask 3: 12 / 12
• Subtask 4: 0 / 17
• Subtask 5: 20 / 20
• Subtask 6: 0 / 10
• Subtask 7: 0 / 19