Submission #1132302

#	Time	Username	Problem	Language	Result	Execution time	Memory
1132302		KasymK	Intergalactic ship (IZhO19_xorsum)	C++20	0 / 100	2095 ms	1980 KiB

xorsum

#include "bits/stdc++.h"
using namespace std;
#define ff first
#define ss second
#define all(v) v.begin(), v.end()
#define ll long long
#define pb push_back
#define pii pair<int, int>
#define pli pair<ll, int>
#define pll pair<ll, ll>
#define tr(i, c) for(auto i = c.begin(); i != c.end(); ++i)
#define wr puts("----------------")
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
const int N = 105;
const int MOD = 1e9+7;
int v[N], same[N];
ll par[N];

int main(){
    int n;
    scanf("%d", &n);
    for(int i = 1; i <= n; ++i)
        scanf("%d", v+i), same[i]=v[i];
    using node = tuple<int, int, int>;
    vector<node> A;
    int q;
    scanf("%d", &q);
    for(int i = 0; i < q; ++i){
        int l, r, x;
        scanf("%d%d%d", &l, &r, &x);
        A.pb({l, r, x});
    }
    vector<node> must;
    ll answer=0;
    for(int mk = 0; mk < (1<<q); ++mk){
        must.clear();
        memset(par, 0, sizeof par);
        for(int i = 0; i < q; ++i)
            if(mk>>i&1)
                must.pb(A[i]);
        tr(it, A){
            int l, r, x;
            tie(l, r, x)=*it;
            for(int i = l; i <= r; ++i)
                v[i]^=x;
        }
        for(int i = 1; i <= n; ++i)
            par[i]=par[i-1]+v[i];
        ll sm=0;
        for(int i = 1; i <= n; ++i)
            for(int j = i; j <= n; ++j)
                (sm+=(par[j]-par[i-1])*(par[j]-par[i-1]))%=MOD;
        (answer+=sm)%=MOD;
        for(int i = 1; i <= n; ++i)
            v[i]=same[i];
    }
    printf("%lld\n", answer);
    return 0;
}

Compilation message (stderr)

xorsum.cpp: In function 'int main()':
xorsum.cpp:22:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
xorsum.cpp:24:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |         scanf("%d", v+i), same[i]=v[i];
      |         ~~~~~^~~~~~~~~~~
xorsum.cpp:28:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     scanf("%d", &q);
      |     ~~~~~^~~~~~~~~~
xorsum.cpp:31:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         scanf("%d%d%d", &l, &r, &x);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 4
• Subtask 2: 0 / 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