Cod sursa(job #1709220)

Utilizator UPB_Darius_Rares_SilviuPeace my pants UPB_Darius_Rares_Silviu Data 28 mai 2016 11:20:42
Problema Twoton Scor 0
Compilator cpp Status done
Runda ONIS 2016 - Runda - 2 - ACM ICPC Romanian Programming Contest Marime 1 kb
#include <stdio.h>
#define NMax 1000050
#define LMax 100010
#define zeros(x) ((-x) &(x))

const int mod = 19997;

int N;
int A[NMax];

int arb[LMax];

void update( int x, int val ) {
    for (; x < LMax ; x += zeros(x))
        arb[x] += val;
}

int query( int x ) {
    int res = 0;
    for (; x > 0; x -= zeros(x))
        res += arb[x];
    return res;
}

int main() {

    freopen("twoton.in", "r", stdin);
    freopen("twoton.out", "w", stdout);

    scanf("%d", &N);

    for ( int i = 1; i <= N; ++ i )
        scanf("%d", &A[i]);

    int res = 0;
    int p2 = 1;

    for ( int i = N; i > 0; -- i ) {
        if ( query(A[i]) ) {
            res += p2;
            if ( res >= mod )
                res -= mod;
        } else {
            res += 1;
            if ( res >= mod )
                res -= mod;
        }
        update(A[i], 1);
        p2 += p2;
        if ( p2 >= mod )
            p2 -= mod;
    }

    printf("%d\n", res);

    return 0;
}