Submission #403346

#	Time	Username	Problem	Language	Result	Execution time	Memory
403346		cpp219	Fire (JOI20_ho_t5)	C++14	0 / 100	178 ms	72184 KiB

ho_t5

#pragma GCC optimization "O2"
#pragma GCC optimization "unroll-loop"
#pragma GCC target ("avx2")

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define fs first
#define sc second
using namespace std;
const ll N = 2e5 + 16;
const ll Log2 = 19;
const ll inf = 1e9 + 7;
typedef pair<ll,ll> LL;
///Road to EF/M

ll s[N],n,Q,T,l,r,ans[N],pre[N],suf[N];

struct Query{
    ll l,r,id;
};
vector<Query> q[N];
vector<LL> f[N],g[N];
ll bit[N];

ll upd(ll p,ll val){
    for (ll i = p;i < N;i += i & -i) bit[i] += val;
}

ll Get(ll p){
    ll res = 0;
    for (ll i = p;i > 0;i -= i & -i) res += bit[i];
    return res;
}
stack<ll> st;
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    #define task "test"
    if (fopen(task".inp", "r")){
        freopen(task".inp", "r", stdin);
        //freopen(task".out", "w", stdout);
    }
    cin>>n>>Q;
    for (ll i = 1;i <= n;i++) cin>>s[i];
    for (ll i = 1;i <= Q;i++){
        cin>>T>>l>>r;
        q[T].push_back({l,r,i});
    }
    for (ll i = 1;i <= n;i++){
        while(!st.empty() && s[st.top()] <= s[i]) st.pop();
        if (!st.empty()) pre[i] = st.top();
        st.push(i);
    }
    while(!st.empty()) st.pop();
    for (ll i = n;i > 0;i--){
        while(!st.empty() && s[st.top()] < s[i]) st.pop();
        if (!st.empty()) suf[i] = st.top();
        else suf[i] = n + 1;
        st.push(i);
    }
    for (ll i = 1;i <= n;i++){
        if (!pre[i] || i - pre[i] > suf[i] - i){
            for (ll j = i;j < suf[i];j++){
                f[j - i].push_back({j,s[i]});
                if (pre[i]) f[j - pre[i]].push_back({j,-s[i]});
            }
        }
        else{
            for (ll j = i;j > pre[i];j--){
                g[i - j].push_back({j,s[i]});
                g[suf[i] - j].push_back({j,-s[i]});
            }
        }
    }
    for (ll i = 0;i <= n;i++){
        for (auto j : f[i]) upd(j.fs,j.sc);
        for (auto j : q[i]) ans[j.id] += Get(j.r) - Get(j.l - 1);
    }
    memset(bit,0,sizeof(bit));
    for (ll i = 0;i <= n;i++){
        for (auto j : g[i]) upd(j.fs,j.sc);
        for (auto j : q[i]) ans[j.id] += Get(j.r) - Get(j.l - 1);
    }
    for (ll i = 1;i <= Q;i++) cout<<ans[i]<<"\n";
}

Compilation message (stderr)

ho_t5.cpp:1: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    1 | #pragma GCC optimization "O2"
      | 
ho_t5.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    2 | #pragma GCC optimization "unroll-loop"
      | 
ho_t5.cpp: In function 'long long int upd(long long int, long long int)':
ho_t5.cpp:28:1: warning: no return statement in function returning non-void [-Wreturn-type]
   28 | }
      | ^
ho_t5.cpp: In function 'int main()':
ho_t5.cpp:41:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 1
• Subtask 2: 0 / 6
• Subtask 3: 0 / 7
• Subtask 4: 0 / 6
• Subtask 5: 0 / 80