Submission #859264

#	Time	Username	Problem	Language	Result	Execution time	Memory
859264		nnhzzz	Triple Jump (JOI19_jumps)	C++14	5 / 100	4022 ms	37204 KiB

jumps

#include<bits/stdc++.h>

using namespace std;

#define task "test"
#define REP(i,a,b) for(int i = (a); i<=(b); ++i)
#define REPD(i,a,b) for(int i = (a); i>=(b); --i)
#define ALL(x) (x).begin(),(x).end()
#define SZ(x) (int)(x).size()
#define BIT(x,i) ((x>>i)&1LL)
#define MASK(i) (1LL<<i)
#define fi first
#define se second
#define vi vector<int>
#define pii pair<int,int>
//-----------------------------------------------------------------------//
const int oo = 1e9,LOG = 19,MAXN = 5e5+7,N = 1e2+3;
const int MOD = 1e9+7,MOD1 = 1e9+207,MOD2 = 1e9+407,MOD3 = 998244353;
//-----------------------------------------------------------------------//
template<typename T> bool mini(T &a, T b){if(a>b){a=b;return true;} return false;}
template<typename T> bool maxi(T &a, T b){if(a<b){a=b;return true;} return false;}

int a[MAXN],f[MAXN][LOG];
int n,q;

int get(int l, int r){
    int k = __lg(r-l+1);
    return max(f[l][k],f[r-MASK(k)+1][k]);
}

void sub1(){
    while(q--){
        int res = 0,l,r; cin >> l >> r;
        REP(i,l,r){
            REP(j,i+1,r){
                int k = j+j-i;
                if(k>r) break;
                maxi(res,a[i]+a[j]+get(k,r));
            }
        }
        cout << res << "\n";
    }
}

void sub2(){
    cout << 0;
}

void sub3(){
    while(q--){
        int res = 0,l,r; cin >> l >> r;
        stack<int> st; vi dp(n+3,0);
        REP(i,l,r){
            while(SZ(st)!=0 && a[st.top()]<a[i]){
                maxi(dp[2*i-st.top()],a[i]+a[st.top()]);
                st.pop();
            }
            if(SZ(st)!=0) maxi(dp[2*i-st.top()],a[i]+a[st.top()]);
            st.push(i);
        }
        REP(i,l,r){
            maxi(dp[i],dp[i-1]);
            maxi(res,dp[i]+a[i]);
        }
        cout << res << "\n";
    }
}

void solve(){
    cin >> n;
    REP(i,1,n){
        cin >> a[i];
        f[i][0] = a[i];
    }
    REP(j,1,LOG-1){
        REP(i,1,n){
            f[i][j] = max(f[i][j-1],f[i+MASK(j-1)][j-1]);
        }
    }
    cin >> q;
    if(n<=100 && q<=100){
        sub1(); return ;
    }
    sub3();
}

signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    if(fopen(task".inp","r")){
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }
    solve();
    return 0;
}

Compilation message (stderr)

jumps.cpp: In function 'void solve()':
jumps.cpp:77:47: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   77 |             f[i][j] = max(f[i][j-1],f[i+MASK(j-1)][j-1]);
      |                                              ~^~
jumps.cpp:11:23: note: in definition of macro 'MASK'
   11 | #define MASK(i) (1LL<<i)
      |                       ^
jumps.cpp: In function 'int main()':
jumps.cpp:91:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   91 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
jumps.cpp:92:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   92 |         freopen(task".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 14
• Subtask 3: 0 / 27
• Subtask 4: 0 / 54