Submission #382243

#	Time	Username	Problem	Language	Result	Execution time	Memory
382243		BartolM	Intergalactic ship (IZhO19_xorsum)	C++17	9 / 100	2080 ms	3164 KiB

xorsum

#include <bits/stdc++.h>

using namespace std;

#define X first
#define Y second
#define mp make_pair
#define pb push_back
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <int, pii> pip;
typedef pair <pii, int> ppi;
typedef pair <ll, ll> pll;

const int INF=0x3f3f3f3f;
const int LOG=7;
const int N=1005;
const int MOD=1e9+7;
const int Q=1e5+5;

int add(int a, int b) {
    a+=b;
    if (a>=MOD) a-=MOD;
    return a;
}

int mul(int a, int b) {
    return (ll)a*b%MOD;
}

int n, q;
int p[N], np[N];
vector <ppi> que;
#define DEBUG 0

void solve() {
    int sol=0;
    for (int mask=0; mask<(1<<q); ++mask) {
        for (int i=0; i<n; ++i) np[i]=p[i];
        for (int i=0; i<q; ++i) {
            if ((1<<i) & mask) {
                for (int j=que[i].X.X; j<=que[i].X.Y; ++j) np[j]=np[j]^que[i].Y;
            }
        }
        for (int i=0; i<n; ++i) {
            for (int j=i; j<n; ++j) {
                int interi=mul(i+1, n-j);

                if (i!=j) interi=mul(interi, 2);

                int curr=mul(np[i], np[j]);
                sol=add(sol, mul(curr, interi));
            }
        }
    }
    printf("%d\n", sol);
}

void load() {
    scanf("%d", &n);
    for (int i=0; i<n; ++i) scanf("%d", p+i);
    scanf("%d", &q);
    for (int i=0; i<q; ++i) {
        int l, r, x;
        scanf("%d %d %d", &l, &r, &x); l--; r--;
        que.pb(mp(mp(l, r), x));
    }
}

int main() {

    load();
    assert(q<=20);

//    pot[0]=1;
//    for (int i=1; i<=q; ++i) pot[i]=mul(pot[i-1], 2);

    solve();
    return 0;
}

Compilation message (stderr)

xorsum.cpp: In function 'void load()':
xorsum.cpp:60:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   60 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
xorsum.cpp:61:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   61 |     for (int i=0; i<n; ++i) scanf("%d", p+i);
      |                             ~~~~~^~~~~~~~~~~
xorsum.cpp:62:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   62 |     scanf("%d", &q);
      |     ~~~~~^~~~~~~~~~
xorsum.cpp:65:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   65 |         scanf("%d %d %d", &l, &r, &x); l--; r--;
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 5 / 5
• Subtask 3: 0 / 6
• Subtask 4: 0 / 9
• Subtask 5: 0 / 8
• Subtask 6: 0 / 11
• Subtask 7: 0 / 19
• Subtask 8: 0 / 30
• Subtask 9: 0 / 8