Submission #570626

#	Time	Username	Problem	Language	Result	Execution time	Memory
570626		Hanksburger	Dango Maker (JOI18_dango_maker)	C++17	100 / 100	312 ms	35908 KiB

dango_maker

#include <bits/stdc++.h>
using namespace std;
bool b[3005][3005], c[3005][3005];
char a[3005][3005];
vector<int> v, w;
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n, m, ans=0;
    cin >> n >> m;
    for (int i=0; i<n; i++)
        for (int j=0; j<m; j++)
            cin >> a[i][j];
    for (int i=0; i<n; i++)
    {
        for (int j=0; j<m; j++)
        {
            if (a[i][j]=='R' && a[i+1][j]=='G' && a[i+2][j]=='W')
                b[i][j]=1;
            if (a[i][j]=='R' && a[i][j+1]=='G' && a[i][j+2]=='W')
                c[i][j]=1;
        }
    }
    for (int i=0; i<=n+m-2; i++)
    {
        for (int j=max(0, i-m+1); j<=min(n-1, i); j++)
        {
            if (b[j][i-j])
                v.push_back(j*2+5);
            if (c[j][i-j])
                v.push_back(j*2);
        }
        for (int j=0; j<v.size(); j++)
        {
            auto itr=upper_bound(w.begin(), w.end(), v[j]);
            if (itr==w.end())
                w.push_back(v[j]);
            else
                *itr=v[j];
        }
        ans+=w.size();
        v.clear();
        w.clear();
    }
    cout << ans;
    return 0;
}

Compilation message (stderr)

dango_maker.cpp: In function 'int main()':
dango_maker.cpp:35:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         for (int j=0; j<v.size(); j++)
      |                       ~^~~~~~~~~

• Subtask 1: 13 / 13
• Subtask 2: 20 / 20
• Subtask 3: 67 / 67