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Submission #792796

# Submission time Handle Problem Language Result Execution time Memory
792796 2023-07-25T08:52:24 Z 반딧불(#10051) Line Town (CCO23_day1problem3) C++17
6 / 25
 276 ms 16284 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
const ll INF = 1e18;

struct segTree{
    int tree[1<<20];

    void init(int i, int l, int r){
        tree[i] = 0;
        if(l==r) return;
        int m = (l+r)>>1;
        init(i*2, l, m);
        init(i*2+1, m+1, r);
    }

    void update(int i, int l, int r, int x, int v){
        if(l==r){
            tree[i] = v;
            return;
        }
        int m = (l+r)>>1;
        if(x<=m) update(i*2, l, m, x, v);
        else     update(i*2+1, m+1, r, x, v);
        tree[i] = tree[i*2] + tree[i*2+1];
    }

    int findRight(int i, int l, int r, int x){
        if(r<x || !tree[i]) return r+1;
        if(l==r) return l;
        int m = (l+r)>>1;
        int tmp = findRight(i*2, l, m, x);
        if(tmp == m+1) return findRight(i*2+1, m+1, r, x);
        else return tmp;
    }

    int findLeft(int i, int l, int r, int x){
        if(x<l || !tree[i]) return l-1;
        if(l==r) return l;
        int m = (l+r)>>1;
        int tmp = findLeft(i*2+1, m+1, r, x);
        if(tmp == m) return findLeft(i*2, l, m, x);
        else return tmp;
    }
} tree;

void imp(){
    puts("-1");
    exit(0);
}

int n;
int arr[500002];

void input();
void solve_nozero();
void solve_zero();

int main(){
    input();
    if(count(arr+1, arr+n+1, 0) == 0) solve_nozero();
    else if(count(arr+1, arr+n+1, 0) == n){
        puts("0");
        return 0;
    }
    else solve_zero();
}

void input(){
    scanf("%d", &n);
    for(int i=1; i<=n; i++) scanf("%d", &arr[i]);
    if(n==1){
        puts("0");
        exit(0);
    }

    vector<int> vec;
    for(int i=1; i<=n; i++) if(arr[i]) vec.push_back(abs(arr[i]));
    sort(vec.begin(), vec.end());
    vec.erase(unique(vec.begin(), vec.end()), vec.end());
    for(int i=1; i<=n; i++){
        if(!arr[i]) continue;
        arr[i] = (lower_bound(vec.begin(), vec.end(), abs(arr[i])) - vec.begin() + 1) * (arr[i]<0 ? -1 : 1);
    }

    int odd1 = 0, even1 = 0;
    for(int i=1; i<=n; i++) if(arr[i] == 1){
        if(i%2) odd1++;
        else even1++;
    }

//    if(n%2==0 && !(odd1-even1 == 0 || odd1-even1 == -1)) imp();
//    if(n%2==1 && !(odd1-even1 == 0 || odd1-even1 ==  1)) imp();
//    if(abs(odd1 - even1) > 1) imp();
}

ll ans;
ll prf[500002], suf[500002];

int c[500002];

void flip(int x){
    c[x] = -c[x];
    if(1<x) tree.update(1, 1, n-1, x-1, c[x] == c[x-1]);
    if(x<n) tree.update(1, 1, n-1, x, c[x] == c[x+1]);
}

void solve_nozero(){
    for(int i=0; i<=n+1; i++) prf[i] = suf[i] = INF;
    prf[0] = 0;
    suf[n+1] = 0;
    ll cnt = 0;
    int MX = 0;

    /// prf�� ���Ѵ�
    tree.init(1, 1, n-1);
    for(int i=1; i<=n; i++) c[i] = arr[i];
    for(int i=1; i<n; i++) if(c[i] == c[i+1]) tree.update(1, 1, n-1, i, 1);

    cnt = 0, MX = 0;
    for(int i=1; i<=n; i++){
        if(c[i] == -1){
            if(i >= MX) prf[i] = cnt;
            continue;
        }
//        int j = i+1;
//        while(j<=n && c[j] != c[j-1]) j++;
        int j = tree.findRight(1, 1, n-1, i) + 1;
        if(j>n) break;
        MX = max(MX, j);

        cnt += j-i;
        flip(j), flip(i);
        if(MX<=i+1) prf[++i] = cnt;
    }

    /// suf�� ���Ѵ�
    tree.init(1, 1, n-1);
    for(int i=1; i<=n; i++) c[i] = arr[i];
    for(int i=1; i<n; i++) if(c[i] == c[i+1]) tree.update(1, 1, n-1, i, 1);

    cnt = 0, MX = n+1;
    for(int i=n; i>=1; i--){
        if(c[i] == 1){
            if(i <= MX) suf[i] = cnt;
            continue;
        }
//        int j = i-1;
//        while(j>=1 && c[j] != c[j+1]) j--;
        int j = tree.findLeft(1, 1, n-1, i-1);
        if(j<1) break;
        MX = min(MX, j);

        cnt += i-j;
        flip(j), flip(i);
        if(MX>=i-1) suf[--i] = cnt;
    }

    ans = INF;
    for(int i=0; i<=n; i++) ans = min(ans, prf[i] + suf[i+1]);
//    assert(ans != INF);
    printf("%lld", ans == INF ? -1 : ans);
}

ll dist[500002];
ll distA[500002], distB[500002];

void solve_zero(){
    ll cnt = 0;
    int MX, k, loc, S = n - count(arr+1, arr+n+1, 0);
    for(int i=0; i<=S+1; i++) prf[i] = suf[i] = INF;
    prf[0] = 0;
    suf[S+1] = 0;

    { /// dist�� ���ϴ� �κ�
        int cnt = 0, other = 0;
        for(int i=1; i<=n; i++){
            if(arr[i]){
                other++;
                continue;
            }
            cnt++; /// cnt��° 0
            int x = other; /// ���⼭ �̵� �Ÿ��� 0���� �ּ�

            distA[0]--, distB[0] += x;
            distA[x]+=2, distB[x] -= x*2;
        }
        for(int i=0; i<=n; i++){
            if(i) distA[i] += distA[i-1], distB[i] += distB[i-1];
            dist[i] = distA[i] * i + distB[i];
        }
    }

    /// �迭 ���ļ� �ű�
    k=0, loc=0;
    for(int i=1; i<=n; i++){
        if(arr[i] == 0) k++;
        else c[++loc] = arr[i] * (k%2 == 0 ? 1 : -1);
    }
    if(S==1) prf[1] = (c[1] == -1 ? 0 : INF);
    else{
        tree.init(1, 1, S-1);
        for(int i=1; i<S; i++) if(c[i] == c[i+1]) tree.update(1, 1, S-1, i, 1);
        cnt = 0, MX = 0;
        for(int i=1; i<=S; i++){
            if(c[i] == -1){
                if(i >= MX) prf[i] = cnt;
                continue;
            }
            int j = tree.findRight(1, 1, S-1, i) + 1;
            if(j>n) break;
            MX = max(MX, j);

            cnt += j-i;
            flip(j), flip(i);
            if(MX<=i+1) prf[++i] = cnt;
        }
    }

    /// �迭 ���ļ� �ű�
    k=0, loc=S;
    for(int i=n; i>=1; i--){
        if(arr[i] == 0) k++;
        else c[loc--] = arr[i] * (k%2 == 0 ? 1 : -1);
    }
    if(S==1) suf[S] = (c[S] == 1 ? 0 : INF);
    else{
        tree.init(1, 1, S-1);
        for(int i=1; i<S; i++) if(c[i] == c[i+1]) tree.update(1, 1, S-1, i, 1);
        cnt = 0, MX = S+1;
        for(int i=S; i>=1; i--){
            if(c[i] == 1){
                if(i <= MX) suf[i] = cnt;
                continue;
            }
            int j = tree.findLeft(1, 1, S-1, i-1);
            if(j<1) break;
            MX = min(MX, j);

            cnt += i-j;
            flip(j), flip(i);
            if(MX>=i-1) suf[--i] = cnt;
        }
    }

    ans = INF;
    for(int i=0; i<=S; i++) ans = min(ans, prf[i] + suf[i+1] + dist[i]);
//    assert(ans != INF);
    printf("%lld", ans == INF ? -1 : ans);
}

Compilation message

Main.cpp: In function 'void input()':
Main.cpp:72:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
Main.cpp:73:34: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |     for(int i=1; i<=n; i++) scanf("%d", &arr[i]);
      |                             ~~~~~^~~~~~~~~~~~~~~

Subtask #1
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 2 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct

Subtask #2
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 2 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 268 ms 16260 KB Output is correct
16 Correct 276 ms 16152 KB Output is correct
17 Correct 269 ms 16260 KB Output is correct
18 Correct 271 ms 16264 KB Output is correct
19 Correct 274 ms 16256 KB Output is correct
20 Correct 275 ms 16260 KB Output is correct
21 Correct 242 ms 16256 KB Output is correct
22 Correct 240 ms 16284 KB Output is correct
23 Correct 238 ms 16256 KB Output is correct
24 Correct 275 ms 16256 KB Output is correct

Subtask #3
0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 2 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Incorrect 1 ms 340 KB Output isn't correct
18 Halted 0 ms 0 KB -

Subtask #4
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 2 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 268 ms 16260 KB Output is correct
16 Correct 276 ms 16152 KB Output is correct
17 Correct 269 ms 16260 KB Output is correct
18 Correct 271 ms 16264 KB Output is correct
19 Correct 274 ms 16256 KB Output is correct
20 Correct 275 ms 16260 KB Output is correct
21 Correct 242 ms 16256 KB Output is correct
22 Correct 240 ms 16284 KB Output is correct
23 Correct 238 ms 16256 KB Output is correct
24 Correct 275 ms 16256 KB Output is correct
25 Correct 0 ms 340 KB Output is correct
26 Correct 0 ms 340 KB Output is correct
27 Correct 0 ms 212 KB Output is correct
28 Incorrect 1 ms 340 KB Output isn't correct
29 Halted 0 ms 0 KB -

Subtask #5
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Incorrect 0 ms 340 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Incorrect 0 ms 340 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 2.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 2 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Incorrect 1 ms 340 KB Output isn't correct
18 Halted 0 ms 0 KB -

Subtask #8
0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 2 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 268 ms 16260 KB Output is correct
16 Correct 276 ms 16152 KB Output is correct
17 Correct 269 ms 16260 KB Output is correct
18 Correct 271 ms 16264 KB Output is correct
19 Correct 274 ms 16256 KB Output is correct
20 Correct 275 ms 16260 KB Output is correct
21 Correct 242 ms 16256 KB Output is correct
22 Correct 240 ms 16284 KB Output is correct
23 Correct 238 ms 16256 KB Output is correct
24 Correct 275 ms 16256 KB Output is correct
25 Correct 0 ms 340 KB Output is correct
26 Correct 0 ms 340 KB Output is correct
27 Correct 0 ms 212 KB Output is correct
28 Incorrect 1 ms 340 KB Output isn't correct
29 Halted 0 ms 0 KB -