Submission #905787

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Source Code Expand

#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;

template<class Cmp=less_equal<int>>
class SparseTableRMQ{
public:
    SparseTableRMQ(){
    }
    SparseTableRMQ(int *ar, int n): n(n), data(n){
        for(int i = 0; i < n;++i) data[i] = ar[i];
        table = buildRMQ();
    }

    int queryPos(int l, int r){
        int k = lgInt(r - l - 1);
        int lid = table[l + n*k], rid = table[r + n*k - (1 << k)];
        return (cmp(data[lid], data[rid])) ? lid : rid;
    }

    int queryValue(int l, int r){
        return data[queryPos(l, r)];
    }
private:
    int n;
    vector<int> data, table;
    Cmp cmp;
    int lgInt(int v){
        static const unsigned b[] = {0x2, 0xC, 0xF0, 0xFF00, 0xFFFF0000};
        static const unsigned S[] = {1, 2, 4, 8, 16};
        int res = 0;
        for (int i = 4; i >= 0; i--) {
            if (v & b[i]) {
                v >>= S[i];
                res |= S[i];
            }
        }
        return res;
    }

    vector<int> buildRMQ() {
        int logn = 1;
        for (int k = 1; k < n; k *= 2) ++logn;
        vector<int> b(n*logn);
        for(int i = 0; i < n; ++i)b[i] = i;
        int cur = 0;
        for(int k = 1; k < n; k *= 2){
            copy(b.begin() + cur, b.begin() + cur + n, b.begin() + cur + n);
            cur += n;
            for(int i = 0; i < n - k; ++i){
                int idl = b[cur + i], idr = b[cur + i + k];
                if(cmp(data[idl], data[idr])){
                    b[cur + i] = idl;
                } else{
                    b[cur + i] = idr;
                }
            }
        }
        return b;
    }
};
typedef SparseTableRMQ<less_equal<int>> RMinQ;
typedef SparseTableRMQ<greater_equal<int>> RMaxQ;

int N, A[200001];

int main(){
    cin >> N;
    rep(i, N)scanf("%d", &A[i]);
    RMinQ rmq(A, N);

    ll X = 0;
    rep(i, N){
        int l = -1, r = i, m, L, R;
        while(r - l > 1){
            m = (l + r) / 2;
            if(rmq.queryValue(m, i + 1) >= A[i])r = m;
            else l = m;
        }
        L = r;
        l = i+1, r = N+1;
        while(r - l > 1){
            m = (l + r) / 2;
            if(rmq.queryValue(i, m) < A[i])r = m;
            else l = m;
        }
        R = l;
        X += (i-L+1ll)*(R-i)*(ll)A[i];
    }
    cout << X << endl;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:82:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     rep(i, N)scanf("%d", &A[i]);
                                ^

Judge Result