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Submission #667227

# Submission time Handle Problem Language Result Execution time Memory
667227 2022-11-30T20:53:20 Z divad Subway (info1cup19_subway) C++14
100 / 100
 7 ms 724 KB 
#include <iostream>
#define int long long
using namespace std;
int k;

int gauss(int n){
    return n*(n+1)/2;
}

signed main()
{
    cin >> k;
    int ans = 0, st = 1, dr = 45000;
    /// 1 1 1 1 1 0 0 0 0 0 0
    ///         ^
    while(st <= dr){
        int mid = (st+dr)/2;
        if(gauss(mid) <= k){
            ans = mid;
            st = mid+1;
        }else{
            dr = mid-1;
        }
    }
    int rest = k-gauss(ans);
    int cnt = 1+ans+(rest > 0);
    cout << ans+1+(rest > 0) << "\n";
    cout << "0 -1\n";
    for(int i = 1; i <= ans; i++){
        cout << i << " " << i-1 << "\n";
    }
    if(rest){
        cout << ans+1 << " " << rest-1 << "\n";
    }
    return 0;
}

Compilation message

subway.cpp: In function 'int main()':
subway.cpp:26:9: warning: unused variable 'cnt' [-Wunused-variable]
   26 |     int cnt = 1+ans+(rest > 0);
      |         ^~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 296 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 296 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 0 ms 300 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct

Subtask #3
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 296 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 0 ms 300 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 2 ms 340 KB Output is correct
12 Correct 2 ms 296 KB Output is correct
13 Correct 2 ms 340 KB Output is correct
14 Correct 2 ms 340 KB Output is correct
15 Correct 2 ms 340 KB Output is correct
16 Correct 7 ms 724 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 7 ms 724 KB Output is correct
19 Correct 6 ms 596 KB Output is correct
20 Correct 5 ms 596 KB Output is correct