Submission #787446

#	Time	Username	Problem	Language	Result	Execution time	Memory
787446		guagua0407	Dango Maker (JOI18_dango_maker)	C++17	0 / 100	5 ms	9172 KiB

dango_maker

//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

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

const int mxn=3010;
char grid[mxn][mxn];
int dp[mxn][mxn][3];

int main() {_
    int n,m;
    cin>>n>>m;
    for(int i=0;i<mxn;i++){
        fill(grid[i],grid[i]+mxn,'.');
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            cin>>grid[i][j];
        }
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            if(grid[i-1][j]=='R' and grid[i][j]=='G' and grid[i+1][j]=='W'){
                dp[i][j][0]=1;
            }
            if(grid[i][j-1]=='R' and grid[i][j]=='G' and grid[i][j+1]=='W'){
                dp[i][j][1]=1;
            }
        }
    }
    int ans=0;
    for(int gap=-(m-1);gap<n;gap++){
        int x,y;
        for(int i=1;i<=n;i++){
            int j=i-gap;
            if(j<1 or j>m) continue;
            dp[i][j][0]+=max(dp[i-1][j-1][0],dp[i-1][j-1][2]);
            dp[i][j][1]+=max(dp[i-1][j-1][1],dp[i-1][j-1][2]);
            dp[i][j][2]+=max({dp[i-1][j-1][0],dp[i-1][j-1][1],dp[i-1][j-1][2]});
            x=i,y=j;
        }
        ans+=max({dp[x][y][0],dp[x][y][1],dp[x][y][2]});
    }
    cout<<ans<<'\n';
    return 0;
}
//maybe its multiset not set

Compilation message (stderr)

dango_maker.cpp: In function 'void setIO(std::string)':
dango_maker.cpp:12:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
dango_maker.cpp:13:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
dango_maker.cpp: In function 'int main()':
dango_maker.cpp:52:53: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
   52 |         ans+=max({dp[x][y][0],dp[x][y][1],dp[x][y][2]});
      |                                           ~~~~~~~~~~^
dango_maker.cpp:52:53: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]

• Subtask 1: 0 / 13
• Subtask 2: 0 / 20
• Subtask 3: 0 / 67