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Submission #477828

# Submission time Handle Problem Language Result Execution time Memory
477828 2021-10-04T04:42:11 Z sumit_kk10 Walking (NOI12_walking) C++17
25 / 25
 1 ms 336 KB 
#include <bits/stdc++.h>
#define fast ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL)
#define ll long long int
#define ld long double
using namespace std;
const int N = 1e6 + 5;
const int MOD = 1e9 + 7;
int len, n;
pair<int, int> tim[N];

void solve(){
    cin >> len >> n;
    for(int i = 1; i <= n; ++i)
        cin >> tim[i].first >> tim[i].second;
    sort(tim + 1, tim + n + 1);
    int dp[n + 1], ans = 0;
    for(int i = 1; i <= n; ++i)
        dp[i] = 1;
    for(int i = n - 1; i >= 1; --i){
        for(int j = i + 1; j <= n; ++j){
            ld cur = (ld) ((ld) len/(ld) tim[i].second) + tim[i].first;
            if(cur > (ld) ((ld) len / (ld) tim[j].second) + tim[j].first)
                dp[i] = max(dp[i], dp[j] + 1);
        }
        ans = max(ans, dp[i]);
    }
    cout << ans << "\n";
}

int main(){
    fast;
    int t = 1;
    // cin >> t;
    while(t--)
        solve();
    return 0;
}

Subtask #1
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct

Subtask #2
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 208 KB Output is correct
3 Correct 1 ms 208 KB Output is correct
4 Correct 1 ms 208 KB Output is correct

Subtask #4
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 208 KB Output is correct
3 Correct 1 ms 208 KB Output is correct
4 Correct 1 ms 208 KB Output is correct

Subtask #5
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 208 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 208 KB Output is correct