oj.uz

Submission #1103126

# Submission time Handle Problem Language Result Execution time Memory
1103126 2024-10-20T07:44:25 Z DuongKiet Feast (NOI19_feast) C++17
30 / 100
 33 ms 2840 KB 
#include <bits/stdc++.h>
#define N 300005
#define inf 100000000000000000LL
#define ll long long
#define int long long
#define ii pair <int,long long>
#define fi first
#define se second
#define all(x) x.begin(),x.end()
#define pb push_back

using namespace std;

const unsigned ll Mod = 1000000007LL;

int n, k, a[N];
void init(){

    cin >> n >> k;
    for (int i = 1; i <= n; i++)
        cin >> a[i];
}
bool ifsub1(){

    for (int i = 1; i <= n; i++)
        if (a[i] < 0) return 0;
    return 1;
}
void sub1(){

    int ans = 0;
    for (int i = 1; i <= n; i++)
        ans += a[i];
    cout << ans << '\n';
}
int pos;
bool ifsub2(){

    int cnt = 0;
    for (int i = 1; i <= n; i++)
        if (a[i] < 0) {pos = a[i]; cnt++;}
    return (cnt < 2);
}
void sub2(){

    int sum = 0, suml = 0, am = 0;
    bool kt = 0;
    for (int i = 1; i <= n; i++){
        if (a[i] < 0) {
            kt = 1;
            am = a[i];
        }
        if (!kt) suml += a[i];
        sum += a[i];
    }
    if (k > 1)
        cout << sum - am << '\n';
    else cout << max(suml, max(sum, sum - suml - am));
}
void sub3(){
    int ans = 0, res = 0;
    for (int i = 1; i <= n; i++) {
        res = max(0ll, res + a[i]);
        ans = max(ans, res);
    }
    cout << ans << '\n';
}
//int pa[N], sz[N];
//int findpa(int u){
//
//    if (u == pa[u]) return u;
//    return pa[u] = findpa(pa[u]);
//}
//void Union(int a, int b){
//
//    a = findpa(a);
//    b = findpa(b);
//    if (a == b) return;
//    if (sz[a] < sz[b]) swap(a,b);
//    pa[b] = a;
//    sz[a] += sz[b];
//    sum[a] += sum[b];
//}
//vector <ii> d;
//void Add(int u){
//    d.pb({u, sum[u]});
//}
//void sub6(){
//    for (int i = 1; i <= n; i++){
//        pa[i] = i;
//        sz[i] = 1;
//        sum[i] = a[i];
//    }
//    int parduong, param;
//    bool task = 0;
//    if (a[1] >= 0) {parduong = 1; task = 1;}
//    else param = 1;
//    for (int i = 1; i <= n; i++){
//        if (a[i] >= 0) {
//            if (task)
//                Union(parduong, i);
//            else parduong = i;
//            task = 1;
//        }
//        else {
//            if (!task) Union(param, i);
//            else param = i;
//            task = 0;
//        }
//    }
//    int curpa = findpa(1);
//    Add(curpa);
//    for (int i = 1; i <= n; i++){
//        int u = findpa(i);
//        if (u != curpa){
//            curpa = u;
//            Add(u);
//        }
//    }
//    for (int i = 2; i < d.size(); i++){
//        if (d[i].se > 0 && d[i-2].se > 0){
//            g.pb({d[i].fi, d[i - 2].fi, d[i].se + d[i].se });
//        }
//    }
//}
signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);cout.tie(0);
    #define nametask "PRESUFF"
    if(fopen(nametask".inp", "r")) {
        freopen(nametask".inp", "r", stdin);
        freopen(nametask".out", "w", stdout);
    }
    init();
    if (ifsub1()) return sub1(), 0;
    if (ifsub2()) return sub2(), 0;
    if (k == 1) return sub3(), 0;
//    if (k <= n && n <= 2000) return sub6(), 0;
    return 0;
}
/// Duong Anh Kiet from Kien Giang ///
/*
6 1
-1 -2 -1 2 -1 2
*/

Compilation message

feast.cpp: In function 'int main()':
feast.cpp:132:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  132 |         freopen(nametask".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
feast.cpp:133:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  133 |         freopen(nametask".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 2640 KB Output is correct
2 Correct 21 ms 2696 KB Output is correct
3 Correct 22 ms 2808 KB Output is correct
4 Correct 22 ms 2640 KB Output is correct
5 Correct 21 ms 2808 KB Output is correct
6 Correct 21 ms 2696 KB Output is correct
7 Correct 22 ms 2640 KB Output is correct
8 Correct 22 ms 2840 KB Output is correct
9 Correct 21 ms 2640 KB Output is correct
10 Correct 19 ms 2640 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 2640 KB Output is correct
2 Correct 13 ms 2640 KB Output is correct
3 Correct 13 ms 2700 KB Output is correct
4 Correct 15 ms 2640 KB Output is correct
5 Correct 22 ms 2808 KB Output is correct
6 Correct 13 ms 2640 KB Output is correct
7 Correct 13 ms 2640 KB Output is correct
8 Correct 21 ms 2808 KB Output is correct
9 Correct 29 ms 2640 KB Output is correct
10 Correct 13 ms 2640 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 2640 KB Output is correct
2 Correct 25 ms 2692 KB Output is correct
3 Correct 25 ms 2640 KB Output is correct
4 Correct 25 ms 2640 KB Output is correct
5 Correct 26 ms 2688 KB Output is correct
6 Correct 27 ms 2640 KB Output is correct
7 Correct 25 ms 2692 KB Output is correct
8 Correct 26 ms 2640 KB Output is correct
9 Correct 25 ms 2700 KB Output is correct
10 Correct 33 ms 2688 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Incorrect 1 ms 336 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Incorrect 1 ms 336 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Incorrect 1 ms 336 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 2640 KB Output is correct
2 Correct 21 ms 2696 KB Output is correct
3 Correct 22 ms 2808 KB Output is correct
4 Correct 22 ms 2640 KB Output is correct
5 Correct 21 ms 2808 KB Output is correct
6 Correct 21 ms 2696 KB Output is correct
7 Correct 22 ms 2640 KB Output is correct
8 Correct 22 ms 2840 KB Output is correct
9 Correct 21 ms 2640 KB Output is correct
10 Correct 19 ms 2640 KB Output is correct
11 Correct 15 ms 2640 KB Output is correct
12 Correct 13 ms 2640 KB Output is correct
13 Correct 13 ms 2700 KB Output is correct
14 Correct 15 ms 2640 KB Output is correct
15 Correct 22 ms 2808 KB Output is correct
16 Correct 13 ms 2640 KB Output is correct
17 Correct 13 ms 2640 KB Output is correct
18 Correct 21 ms 2808 KB Output is correct
19 Correct 29 ms 2640 KB Output is correct
20 Correct 13 ms 2640 KB Output is correct
21 Correct 25 ms 2640 KB Output is correct
22 Correct 25 ms 2692 KB Output is correct
23 Correct 25 ms 2640 KB Output is correct
24 Correct 25 ms 2640 KB Output is correct
25 Correct 26 ms 2688 KB Output is correct
26 Correct 27 ms 2640 KB Output is correct
27 Correct 25 ms 2692 KB Output is correct
28 Correct 26 ms 2640 KB Output is correct
29 Correct 25 ms 2700 KB Output is correct
30 Correct 33 ms 2688 KB Output is correct
31 Correct 1 ms 336 KB Output is correct
32 Incorrect 1 ms 336 KB Output isn't correct
33 Halted 0 ms 0 KB -