Submission #63536830

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Source Code Expand

//People who believe in miracles are as amazing as miracles themselves.
#include<bits/stdc++.h>
#define ll long long
using namespace std;
inline ll read(){
    ll x=0,f=1;char ch=getchar();
    while(ch<'0'||ch>'9'){if(ch=='-') f=-f;ch=getchar();}
    while(ch>='0'&&ch<='9')x=(x<<3)+(x<<1)+(ch^48),ch=getchar();
    return x*f;
}

const int N=2e5+10;
int n,m,a[N],ans=INT_MAX,num[10][1<<9];

inline void solve(){
    n=read(),m=read();
    for(int i=1;i<=n;++i)
        for(int x,j=0;j<m;++j) scanf("%1d",&x),a[i]=(a[i]<<1)|x;
    if(m==1) return puts("0"),void();
    int A=m/2,B=m-A,SA=(1<<A)-1,SB=(1<<B)-1;
    for(int s=0;s<=SA;++s){
        memset(num,0,sizeof num);
        for(int i=1;i<=n;++i){
            int p=(a[i]>>B)^s,q=a[i]&SB;
            ++num[__builtin_popcount(p)][q];
        }
        for(int t=0;t<=SB;++t){
            int sum=0;
            for(int i=0;i<=A;++i)
                for(int j=0;j<=SB;++j){
                    int cnt=i+__builtin_popcount(t^j);
                    sum+=num[i][j]*min(cnt,m-cnt);
                }
            ans=min(ans,sum);
        }
    }
    printf("%d\n",ans);
}

signed main(){
#ifndef ONLINE_JUDGE
    freopen("../1.in","r",stdin);
    freopen("../1.out","w",stdout);
#endif
    return solve(),0;
}

Submission Info

Compile Error

Main.cpp: In function ‘void solve()’:
Main.cpp:18:37: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   18 |         for(int x,j=0;j<m;++j) scanf("%1d",&x),a[i]=(a[i]<<1)|x;
      |                                ~~~~~^~~~~~~~~~

Judge Result