oj.uz

Submission #1071433

# Submission time Handle Problem Language Result Execution time Memory
1071433 2024-08-23T07:21:15 Z zh_h Snail (NOI18_snail) C++17
37 / 100
 1 ms 604 KB 
#include <bits/stdc++.h>
#define lint long long
#define pb push_back
#define mp make_pair
using namespace std;
lint MOD = 1e9 + 7;
int INF = 1e9;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    lint height, n;
    cin >> height >> n;

    //* while taking the input, find:
    //* 1. the average move per day
    //* 2. the highest that you can reach per day

    vector<lint> p;
    lint ave=0, highest=0, lowest=0;
    lint count=0;
    for(lint i = 0; i < n; i ++){
        lint temp;
        cin >> temp;
        p.pb(temp);

        count += temp;
        // if(count < 0){count = 0;}
        highest = max(highest, count);
        lowest = min(lowest, count);

        ave += temp;
    }

    if(highest >= height){
        lint total = 0;
        for(lint i = 0; i < n; i ++){
            total += p[i];
            if(total < 0){total = 0;}
            if(total >= height){
                cout << 0 << " " << i;
                break;
            }
        }
    }
    else if(ave <= 0){
        cout << -1 << " " << -1;
    }
    else{
        //* after N days
        //* at the N+1_th days, the snail reach the highest at some moment
        //* so basically, N*ave < height, N*ave + highest >= height
        //* search the N+1_th day

        //* first step: find smallest N such that N*ave >= height - highest
        //* can use binary search
        //* or just MATH

        //* so we need a new "highest" due to the technical issue...
        //* (for some reason but i lazy to explain why)
        highest = 0;
        lint counting = 0;
        for(int i = 0; i < n; i ++){
            counting += p[i];
            highest = max(highest, counting);
        }

        lint N;
        //*ceil((height - highest)/ave;
        N = (height - highest + ave - 1) / ave;
        
        lint total = N*ave;
        for(lint i = 0; i < n; i ++){
            total += p[i];
            if(total < 0){total = 0;}
            if(total >= height){
                cout << N << " " << i;
                break;
            }
        }
        
    }

    return 0;
}

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 344 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 348 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 1 ms 604 KB Output is correct

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 600 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Incorrect 0 ms 348 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 604 KB Output is correct
2 Correct 1 ms 604 KB Output is correct
3 Correct 1 ms 604 KB Output is correct
4 Correct 1 ms 604 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 1 ms 604 KB Output is correct

Subtask #5
0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 344 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 348 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 604 KB Output is correct
13 Correct 1 ms 604 KB Output is correct
14 Correct 1 ms 600 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Incorrect 0 ms 348 KB Output isn't correct
17 Halted 0 ms 0 KB -