Submission #92698

#	Time	Username	Problem	Language	Result	Execution time	Memory
92698		Kastanda	Strah (COCI18_strah)	C++11	110 / 110	113 ms	24156 KiB

strah

#include<bits/stdc++.h>
using namespace std;
const int N = 2009;
int n, m, dn[N][N], P[N];
long long tot, sum, dp[N];
char A[N][N];
vector < int > Q[N];
int Find(int v)
{
    return ((P[v] > 0) ? (P[v] = Find(P[v])) : v);
}
inline void Merge(int v, int u)
{
    v = Find(v);
    u = Find(u);
    if (v == u)
        return ;
    sum -= dp[-P[v]];
    sum -= dp[-P[u]];
    P[v] += P[u];
    P[u] = v;
    sum += dp[-P[v]];
}
int main()
{
    scanf("%d%d", &n, &m);
    for (int i = 1; i <= n; i++)
        scanf("%s", &A[i][1]);
    for (int i = n; i; i--)
        for (int j = 1; j <= m; j++)
        {
            dn[i][j] = dn[i + 1][j];
            if (A[i][j] == '#')
                dn[i][j] = i;
            else if (i == n)
                dn[i][j] = i + 1;
        }
    for (int i = 1; i < N; i++)
        for (int j = 1; j <= i; j++)
            dp[i] += (i - j + 1) * j;
    for (int i = 1; i <= n; i++)
    {
        sum = 0;
        memset(P, 0, sizeof(P));
        for (int j = 1; j <= m; j++)
            Q[dn[i][j] - 1].push_back(j);
        for (int j = n; j >= i; j--)
        {
            for (int &id : Q[j])
            {
                P[id] = -1;
                sum += dp[1];
                if (P[id - 1])
                    Merge(id, id - 1);
                if (P[id + 1])
                    Merge(id, id + 1);
            }
            tot += 1ll * sum * (j - i + 1);
        }
        for (int j = 0; j <= n; j++)
            Q[j].clear();
    }
    return !printf("%lld", tot);
}

Compilation message (stderr)

strah.cpp: In function 'int main()':
strah.cpp:26:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~
strah.cpp:28:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%s", &A[i][1]);
         ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 11 / 11
• Subtask 3: 11 / 11
• Subtask 4: 11 / 11
• Subtask 5: 11 / 11
• Subtask 6: 11 / 11
• Subtask 7: 11 / 11
• Subtask 8: 11 / 11
• Subtask 9: 11 / 11
• Subtask 10: 11 / 11