Submission #615995

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Source Code Expand

#include <cstdio>
#include <algorithm>
#include <stack>
#include <queue>
#include <deque>
#include <vector>
#include <string>
#include <string.h>
#include <cstdlib>
#include <ctime>
#include <cmath>
#include <map>
#include <set>
#include <iostream>
#include <sstream>
#include <numeric>
#include <cctype>
#include <bitset>
#define fi first
#define se second
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define rrep(i,n) for(int i = 1; i <= (n); ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
#define gep(i,g,j) for(int i = g.head[j]; i != -1; i = g.e[i].next)
#define each(it,c) for(__typeof((c).begin()) it=(c).begin();it!=(c).end();it++)
#define rng(a) a.begin(),a.end()
#define maxs(x,y) x = max(x,y)
#define mins(x,y) x = min(x,y)
#define pb push_back
#define sz(x) (int)(x).size()
#define pcnt __builtin_popcount
#define snuke srand((unsigned)clock()+(unsigned)time(NULL));
#define df(x) int x = in()
using namespace std;
typedef long long int ll;
typedef pair<int,int> P;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<P> vp;
inline int in() { int x; scanf("%d",&x); return x;}
inline void priv(vi a) { rep(i,sz(a)) printf("%d%c",a[i],i==sz(a)-1?'\n':' ');}

const int MX = 100005, INF = 1001001001;
const ll LINF = 1e18;
const double eps = 1e-10;

ll solve(vvl& d) {
  int h = sz(d);
  int w = sz(d[0])-1;
  rep(i,h)rep(j,w) d[i][j+1] += d[i][j];
  vvl s(2,vl(h, -LINF));
  rep(ri,2) {
    rep(l,w)rep(r,w) if (l <= r) {
      ll sum = 0, mn = 0;
      rep(i,h) {
        sum += d[i][r+1]-d[i][l];
        maxs(s[ri][i], sum-mn);
        mins(mn, sum);
      }
    }
    reverse(rng(d));
  }
  ll res = -LINF;
  rep(i,h-1) maxs(res, s[0][i]+s[1][h-2-i]);
  return res;
}


int main() {
  int h, w;
  scanf("%d%d",&h,&w);
  vvl d(h,vl(w+1));
  rep(i,h)rep(j,w) scanf("%lld",&d[i][j+1]);
  vvl e(w,vl(h+1));
  rep(i,h)rep(j,w) e[j][i+1] = d[i][j+1];
  ll ans = solve(d);
  maxs(ans, solve(e));
  cout<<ans<<endl;
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:73:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&h,&w);
                      ^
./Main.cpp:75:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   rep(i,h)rep(j,w) scanf("%lld",&d[i][j+1]);
                                            ^

Judge Result