Submission #1035516

#	Time	Username	Problem	Language	Result	Execution time	Memory
1035516		alexander707070	Intergalactic ship (IZhO19_xorsum)	C++14	0 / 100	2023 ms	7412 KiB

xorsum

#include<bits/stdc++.h>
#define MAXN 1007
using namespace std;

struct query{
    int type,val;
};

const int maxa=128;
const long long mod=1e9+7;

int n,d[MAXN],q,l[MAXN],r[MAXN],x[MAXN];
vector<int> qs[MAXN];

int dp[500][150][150];
long long power[100007];
long long cnt[MAXN][MAXN],ans;

vector<query> w;
int li[207][3],tim;

long long rest;

void calcdp(){
    dp[0][0][0]=1;

    for(int pos=1;pos<=w.size();pos++){
        for(int s=0;s<maxa;s++){
            for(int t=0;t<maxa;t++){
                dp[pos][s][t]=dp[pos-1][s][t];

                if(w[pos-1].type==0){
                    dp[pos][s][t]+=dp[pos-1][s^w[pos-1].val][t];
                }

                if(w[pos-1].type==1){
                    dp[pos][s][t]+=dp[pos-1][s][t^w[pos-1].val];
                }

                if(w[pos-1].type==2){
                    dp[pos][s][t]+=dp[pos-1][s^w[pos-1].val][t^w[pos-1].val];
                }

                dp[pos][s][t]%=mod;
            }
        }
    }
}

bool in(int a,int l,int r){
    return a>=l and a<=r;
}

long long calc(int a,int b){
    long long res=0;

    rest=0; tim++;
    w.clear();

    for(int i=1;i<=q;i++){
        if(!in(a,l[i],r[i]) and !in(b,l[i],r[i]))rest++;
        if(in(a,l[i],r[i]) and !in(b,l[i],r[i]) and li[x[i]][0]!=tim){
            w.push_back({0,x[i]});
            li[x[i]][0]=tim;
        }
        if(!in(a,l[i],r[i]) and in(b,l[i],r[i]) and li[x[i]][1]!=tim){
            w.push_back({1,x[i]});
            li[x[i]][1]=tim;
        }
        if(in(a,l[i],r[i]) and in(b,l[i],r[i]) and li[x[i]][2]!=tim){
            w.push_back({2,x[i]});
            li[x[i]][2]=tim;
        }
    }

    calcdp();

    for(long long s=0;s<maxa;s++){
        for(long long t=0;t<maxa;t++){
            res+=(((s*t)*cnt[a][b])%mod) *((dp[w.size()][d[a]^s][d[b]^t]*power[rest])%mod);
            res%=mod;
        }
    }

    return res;
}

int main(){

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>d[i];
    }

    for(int i=1;i<=n;i++){
        for(int f=i;f<=n;f++){
            cnt[i][f]=i*(n-f+1);
            if(i!=f)cnt[i][f]*=2;
        }
    }

    cin>>q;
    for(int i=1;i<=q;i++){
        cin>>l[i]>>r[i]>>x[i];
    }

    power[0]=1;
    for(int i=1;i<=q;i++){
        power[i]=(power[i-1]*2)%mod;
    }

    for(int i=1;i<=n;i++){
        for(int f=i;f<=n;f++){
            ans+=calc(i,f);
            ans%=mod;
        }
    }

    cout<<ans<<"\n";
 
    return 0;
}

Compilation message (stderr)

xorsum.cpp: In function 'void calcdp()':
xorsum.cpp:27:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<query>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |     for(int pos=1;pos<=w.size();pos++){
      |                   ~~~^~~~~~~~~~

• 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