Submission #29462

#	Time	Username	Problem	Language	Result	Execution time	Memory
29462		samir_droubi	Orchard (NOI14_orchard)	C++14	25 / 25	196 ms	16768 KiB

orchard

#include <bits/stdc++.h>
using namespace std;
int b[3][1000005];
int a[155][5005];
int n,m;
void solve1()
{
    int c=0;
    int ans=(1e9);

    for(int i=1;i<=n;++i)
        for(int j=1;j<=m;++j)
        {
            scanf("%d",&a[i][j]);

            if(a[i][j]==0) a[i][j]=1 ;
            else a[i][j]=-1,++c;

            a[i][j]+=a[i-1][j];
        }

    for(int i=1;i<=n;++i)
        for(int j=i;j<=n;++j)
        {
            int mx=0;
            int sm=0;
            for(int k=1;k<=m;++k)
            {
                sm+=a[j][k]-a[i-1][k];
                ans=min(ans,sm-mx);
                mx=max(mx,sm);
            }
        }
    printf("%d\n",c+ans);
}
void solve2()
{
    int c=0;
    int ans=(1e9);

    for(int i=1;i<=n;++i)
        for(int j=1;j<=m;++j)
        {
            scanf("%d",&b[i][j]);

            if(b[i][j]==0) b[i][j]=1 ;
            else b[i][j]=-1,++c;

            b[i][j]+=b[i-1][j];
        }

    for(int i=1;i<=n;++i)
        for(int j=i;j<=n;++j)
        {
            int mx=0;
            int sm=0;
            for(int k=1;k<=m;++k)
            {
                sm+=b[j][k]-b[i-1][k];
                ans=min(ans,sm-mx);
                mx=max(mx,sm);
            }
        }
    printf("%d\n",c+ans);
}
int main()
{
    scanf("%d%d",&n,&m);
    if(m<=5000)
        solve1();
    else
        solve2();
    return 0;
}

Compilation message (stderr)

orchard.cpp: In function 'void solve1()':
orchard.cpp:14:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d",&a[i][j]);
                                 ^
orchard.cpp: In function 'void solve2()':
orchard.cpp:44:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d",&b[i][j]);
                                 ^
orchard.cpp: In function 'int main()':
orchard.cpp:68:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
                        ^

• Subtask 1: 4 / 4
• Subtask 2: 4 / 4
• Subtask 3: 5 / 5
• Subtask 4: 3 / 3
• Subtask 5: 4 / 4
• Subtask 6: 5 / 5