Submission #1693854

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Source Code Expand

#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>

#define REP(i, m, n) for(int i=int(m);i<int(n);i++)
#define EACH(i, c) for (auto &(i): c)
#define all(c) begin(c),end(c)
#define EXIST(s, e) ((s).find(e)!=(s).end())
#define SORT(c) sort(begin(c),end(c))
#define pb emplace_back
#define MP make_pair
#define SZ(a) int((a).size())

//#define LOCAL 0
//#ifdef LOCAL
//#define DEBUG(s) cout << (s) << endl
//#define dump(x)  cerr << #x << " = " << (x) << endl
//#define BR cout << endl;
//#else
//#define DEBUG(s) do{}while(0)
//#define dump(x) do{}while(0)
//#define BR
//#endif


//改造
typedef long long int ll;
using namespace std;
#define INF (1 << 20)
#define INFl (ll)5e15
#define DEBUG 0 //デバッグする時1にしてね

//ここから編集する


int main() {
    int N;
    cin >> N;
//    vector<vector<bool> > flag(N, vector<bool>(N, false));
    vector<int> a(N);
    vector<int> pos(N + 1);

    REP(i, 0, N) {
//        cin >> a[i];
        scanf("%d",&a[i]);
        pos[a[i]] = i;
    }

    set<int> set1;
    set<int> rset;
//    set1.insert(-1);
    set1.insert(N);
    rset.insert(1);

    ll ans = 0;

    for (int i = 1; i <= N; i++) {
        set1.insert(pos[i]);
        rset.insert(-pos[i]);
        auto itA = rset.upper_bound(-pos[i]);
        auto itB = set1.upper_bound(pos[i]);
//        printf("i = %d,*itA = %d,*itB = %d\n", i, -*itA, *itB);
        ans += 1LL * i * (pos[i] + *itA) * (*itB - pos[i]);
    }

    cout << ans << endl;


    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:74:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&a[i]);
                          ^

Judge Result