Submission #527747

#	Time	Username	Problem	Language	Result	Execution time	Memory
527747		idas	Fancy Fence (CEOI20_fancyfence)	C++11	30 / 100	19 ms	14272 KiB

fancyfence

#include <bits/stdc++.h>
#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr); cout.tie(nullptr)
#define FOR(i, begin, end) for(int i = (begin); i < (end); i++)
#define TSTS int ttt; cin >> ttt; while(ttt--) solve()
#define all(x) (x).begin(), (x).end()
#define le(vec) vec[vec.size()-1]
#define sz(x) ((int)((x).size()))
#define pb push_back
#define s second
#define f first

using namespace std;
typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef map<int, int> mii;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
typedef pair<long double, long double> pdd;

const int INF=1e9, MOD=1e9+7, mod=998244353;
const ll LINF=1e18;

void setIO()
{
    FAST_IO;
}

void setIO(string s)
{
    FAST_IO;
    freopen((s+".in").c_str(), "r", stdin);
    freopen((s+".out").c_str(), "w", stdout);
}

const int N=1e3+10;
ll h[N], w[N], sm[N][N], mn[N][N];
int n;

ll eq(ll x)
{
    return (x+1)*x/2%MOD;
}

int main()
{
    setIO();
    cin >> n;
    FOR(i, 0, n) cin >> h[i];
    FOR(i, 0, n) cin >> w[i];

    FOR(i, 0, n)
    {
        sm[i][i]=w[i];
        mn[i][i]=h[i];
        FOR(j, i+1, n)
        {
            mn[i][j]=min(mn[i][j-1], h[j]);
            sm[i][j]+=w[j];
            sm[i][j]%=MOD;
        }
    }

    ll ans=0;
    FOR(i, 0, n)
    {
        ans+=eq(h[i])*eq(w[i])%MOD;
        ans%=MOD;
        FOR(j, i+1, n)
        {
            ans+=eq(sm[i][j])*eq(mn[i][j])%MOD;
            ans-=eq(sm[i][j]-w[i])*eq(mn[i][j])%MOD;
            ans-=eq(sm[i][j]-w[j])*eq(mn[i][j])%MOD;
            ans+=eq(sm[i][j]-w[i]-w[j])*eq(mn[i][j])%MOD;
            ans%=MOD;
        }
    }

    cout << ans;
}

Compilation message (stderr)

fancyfence.cpp: In function 'void setIO(std::string)':
fancyfence.cpp:32:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |     freopen((s+".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fancyfence.cpp:33:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     freopen((s+".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 0
• Subtask 2: 12 / 12
• Subtask 3: 0 / 13
• Subtask 4: 0 / 15
• Subtask 5: 0 / 15
• Subtask 6: 18 / 18
• Subtask 7: 0 / 27