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Submission #954686

# Submission time Handle Problem Language Result Execution time Memory
954686 2024-03-28T10:51:26 Z Warinchai Lightning Rod (NOI18_lightningrod) C++14
100 / 100
 1415 ms 262144 KB 
#include<bits/stdc++.h>
using namespace std;
vector<pair<int,int>>v;
bool check(pair<int,int>f,pair<int,int>s){
    return abs(f.first-s.first)<=f.second-s.second;
}
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n;cin>>n;
    for(int i=1;i<=n;i++){
        int a,b;cin>>a>>b;
        v.push_back({a,b});
    }
    stack<pair<int,int>>st;
    st.push(v[0]);
    for(int i=1;i<n;i++){
        int a=v[i].first;
        int b=v[i].second;
        if(!check(st.top(),v[i])){
            while(!st.empty()&&check(v[i],st.top())){
                st.pop();
            }
            st.push(v[i]);
        }
    }
    cout<<st.size();
}

Compilation message

lightningrod.cpp: In function 'int main()':
lightningrod.cpp:18:13: warning: unused variable 'a' [-Wunused-variable]
   18 |         int a=v[i].first;
      |             ^
lightningrod.cpp:19:13: warning: unused variable 'b' [-Wunused-variable]
   19 |         int b=v[i].second;
      |             ^

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1195 ms 262144 KB Output is correct
2 Correct 1191 ms 262144 KB Output is correct
3 Correct 1172 ms 261728 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 456 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct

Subtask #3
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 456 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct

Subtask #4
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 456 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 604 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct

Subtask #5
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 456 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 604 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 29 ms 5580 KB Output is correct
15 Correct 29 ms 5320 KB Output is correct
16 Correct 28 ms 5320 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1228 ms 227076 KB Output is correct
2 Correct 1226 ms 226976 KB Output is correct
3 Correct 1187 ms 221648 KB Output is correct

Subtask #7
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1195 ms 262144 KB Output is correct
2 Correct 1191 ms 262144 KB Output is correct
3 Correct 1172 ms 261728 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 456 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 604 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 29 ms 5580 KB Output is correct
18 Correct 29 ms 5320 KB Output is correct
19 Correct 28 ms 5320 KB Output is correct
20 Correct 1228 ms 227076 KB Output is correct
21 Correct 1226 ms 226976 KB Output is correct
22 Correct 1187 ms 221648 KB Output is correct
23 Correct 1415 ms 262144 KB Output is correct
24 Correct 1365 ms 262144 KB Output is correct
25 Correct 1273 ms 258340 KB Output is correct