Submission #978765

#	Time	Username	Problem	Language	Result	Execution time	Memory
978765		SmuggingSpun	Bali Sculptures (APIO15_sculpture)	C++14	100 / 100	70 ms	860 KiB

sculpture

#include<bits/stdc++.h>
#define taskname "sculpture"
using namespace std;
typedef long long ll;
const int INF = 1e9;
template<class T>void minimize(T& a, T b){
	if(a > b){
		a = b;
	}
}
int n, a, b;
vector<int>y;
namespace sub1{
	void solve(){
		ll ans = LLONG_MAX;
		for(int mask = (1 << n) - 2; mask > -1; mask -= 2){
			int cnt_1 = __builtin_popcount(mask) + 1;
			if(a <= cnt_1 && cnt_1 <= b){
				ll value = 0, sum = 0;
				for(int i = 0; i < n; ){
					if(1 << i & mask){
						value |= sum;
						sum = 0;
					}
					sum += y[++i];
				}
				minimize(ans, value | sum);
			}
		}
		cout << ans;
	}
}
namespace sub2{
	const int LIM = 512;
	const int lim = 105;
	bitset<LIM>dp[2][lim];
	void solve(){
		bool cur = true, pre = false;
		int ans = LIM;
		for(int i = 0; i <= n; i++){
			dp[cur][i].reset();
		}
		dp[cur][n + 1].set(0);
		for(int i = 1; i <= b; i++){
			swap(cur, pre);
			for(int j = 0; j <= n; j++){
				dp[cur][j].reset();
			}
			for(int j = 1; j <= n; j++){
				for(int k = j, sum = 0; k <= n; k++){
					sum += y[k];
					for(int value = 0; value < LIM; value++){
						if(dp[pre][k + 1].test(value)){
							dp[cur][j].set(value | sum);
						}
					}
				}
			}
			if(i >= a){
				for(int j = 0; j < ans; j++){
					if(dp[cur][1].test(j)){
						ans = j;
						break;
					}
				}
			}
		}
		cout << ans << "\n";
	}
}
namespace sub3{
	const int LIM = 2048;
	void solve(){
		for(int i = 1; i < LIM; i++){
			vector<int>dp(n + 2, INF);
			dp[n + 1] = 0;
			for(int j = n; j > 0; j--){
				for(int k = j, sum = 0; k <= n; k++){
					if(((sum += y[k]) & i) == sum){
						minimize(dp[j], dp[k + 1] + 1);
					}
				}
			}
			if(dp[1] <= b){
				cout << i;
				break;
			}
		}
	}
}
namespace sub4{
	const int lim = 105;
	bitset<lim>dp[lim];
	void solve(){
		dp[n + 1].set(0);
		ll ans = 0;
		for(int i = 36; i > -1; i--){
			for(int j = 1; j <= n; j++){
				dp[j].reset();
			}
			for(int j = n; j > 0; j--){
				ll sum = 0;
				for(int k = j; k <= n; k++){
					if(((sum += y[k]) & ~ans) < (1LL << i)){
						for(int t = 0; t < n; t++){
							if(dp[k + 1].test(t)){
								dp[j].set(t + 1);
							}
						}
					}
				}
			}
			ans |= 1LL << i;
			for(int j = a; j <= b; j++){
				if(dp[1].test(j)){
					ans ^= 1LL << i;
					break;
				}
			}
		}
		cout << ans;
	}
}
namespace sub5{
	const int lim = 2e3 + 5;
	int dp[lim];
	void solve(){
		ll ans = dp[n + 1] = 0;
		for(int i = 44; i > -1; i--){
			for(int j = n; j > 0; j--){
				ll sum = 0;
				dp[j] = INF;
				for(int k = j; k <= n; k++){
					if(((sum += y[k]) & ~ans) < (1LL << i)){
						minimize(dp[j], dp[k + 1] + 1);
					}
				}
			}
			if(dp[1] > b){
				ans |= 1LL << i;
			}
		}
		cout << ans;
	}
}
int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	if(fopen(taskname".inp", "r")){
		freopen(taskname".inp", "r", stdin);
	}
	cin >> n >> a >> b;
	y.resize(n + 1);
	for(int i = 1; i <= n; i++){
		cin >> y[i];
	}
	if(n <= 20){
		sub1::solve();
	}
	else if(n <= 50 && *max_element(y.begin() + 1, y.end()) <= 10){
		sub2::solve();
	}
	else if(n <= 100 && *max_element(y.begin() + 1, y.end()) <= 20 && a == 1){
		sub3::solve();
	}
	else if(n <= 100){
		sub4::solve();
	}
	else{
		sub5::solve();
	}
}

Compilation message (stderr)

sculpture.cpp: In function 'void sub3::solve()':
sculpture.cpp:79:15: warning: operation on 'sum' may be undefined [-Wsequence-point]
   79 |      if(((sum += y[k]) & i) == sum){
      |          ~~~~~^~~~~~~~
sculpture.cpp:79:15: warning: operation on 'sum' may be undefined [-Wsequence-point]
sculpture.cpp: In function 'int main()':
sculpture.cpp:149:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  149 |   freopen(taskname".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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