Submission #270487

#	Time	Username	Problem	Language	Result	Execution time	Memory
270487		BeanZ	Bali Sculptures (APIO15_sculpture)	C++14	100 / 100	494 ms	1280 KiB

sculpture

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define endl '\n'
const int N = 3e6 + 5;
ll dp[2005][2005], f[2005][2005], a[2005], sum[2005], d[2005], fp[2005];
ll ans = 0;
bool chk(ll now, ll s){
        for (int i = 41; i >= s; i--){
                if ((ans & (1ll << i)) == 0){
                        if (now & (1ll << i)){
                                return false;
                        }
                }
        }
        return true;
}
int main(){
        ios_base::sync_with_stdio(false);
        cin.tie(0);
        if (fopen("VietCT.INP", "r")){
                freopen("VietCT.INP", "r", stdin);
                freopen("VietCT.OUT", "w", stdout);
        }
        ll n, L, R;
        cin >> n >> L >> R;
        for (int i = 1; i <= n; i++) cin >> a[i];
        for (int i = 1; i <= n; i++) sum[i] = sum[i - 1] + a[i];
        if (n > 100){
                for (int s = 41; s >= 0; s--){
                        for (int i = 1; i <= n; i++){
                                fp[i] = d[i];
                        }
                        for (int i = 1; i <= n; i++){
                                if (fp[i] == -1) continue;
                                fp[i] = 1e9;
                                for (int j = 0; j < i; j++){
                                        if (fp[j] == -1) continue;
                                        ll cost = sum[i] - sum[j];
                                        if (chk(cost, s)){
                                                fp[i] = min(fp[i], fp[j] + 1);
                                        }
                                }
                                if (fp[i] == 1e9) fp[i] = -1;
                                //cout << f[i] << " ";
                        }
                        //cout << endl;
                        if (fp[n] <= R && fp[n] != -1){
                                for (int i = 1; i <= n; i++){
                                        if (fp[i] <= R) d[i] = fp[i];
                                        else d[i] = -1;
                                }
                        } else {
                                ans = ans + (1ll << s);
                        }
                }
                cout << ans;
        } else {
                for (int i = 1; i <= R; i++){
                        for (int j = i; j <= n; j++){
                                dp[i][j] = 1;
                        }
                }
                for (int s = 41; s >= 0; s--){
                        for (int i = 1; i <= R; i++){
                                for (int j = i; j <= n; j++){
                                        f[i][j] = dp[i][j];
                                        //cout << f[i][j] << " " << i << " " << j << endl;
                                }
                        }
                        //cout << endl << endl;
                        for (int i = 1; i <= n; i++){
                                if (f[1][i] == 0) continue;
                                if (sum[i] & (1ll << s)) f[1][i] = 0;
                                //cout << f[1][i] << " " << 1 << " " << i << endl;
                        }
                        bool ok = false;
                        if (f[1][n] && 1 >= L) ok = true;
                        for (int i = 2; i <= R; i++){
                                for (int j = i; j <= n; j++){
                                        if (f[i][j] == 0) continue;
                                        bool flag = false;
                                        for (int k = i - 1; k < j; k++){
                                                if (f[i - 1][k] == 0) continue;
                                                ll cost = sum[j] - sum[k];
                                                if (chk(cost, s)){
                                                        flag = true;
                                                        break;
                                                }
                                        }
                                        if (flag) f[i][j] = 1;
                                        else f[i][j] = 0;
                                        //cout << f[i][j] << " " << i << " " << j << endl;
                                }
                                if (i >= L && f[i][n]) ok = true;
                        }
                        //cout << ok << endl;
                        if (ok){
                                for (int i = 1; i <= R; i++){
                                        for (int j = i; j <= n; j++){
                                                dp[i][j] = f[i][j];
                                        }
                                }
                        } else {
                                ans = ans + (1ll << s);
                        }
                        //cout << endl << endl;
                }
                cout << ans;
        }
}
/*
6 1 3
8 1 2 1 5 4
*/

Compilation message (stderr)

sculpture.cpp: In function 'int main()':
sculpture.cpp:24:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   24 |                 freopen("VietCT.INP", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
sculpture.cpp:25:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   25 |                 freopen("VietCT.OUT", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 21 / 21
• Subtask 4: 25 / 25
• Subtask 5: 29 / 29