#include <cstdio> #include <iostream> using namespace std; int n , m , a[1010][1010] , d[1010]; int solve (){ int sol , i , j; sol = -2000000000; for (j=0;j<=m;j++) d[j] = 2000000000; for (i=1;i<=n;i++){ for (j=1;j<=m;j++){ d[j] = min( min(d[j-1] , d[j]) , a[i][j] - i - j ); sol = max (sol , a[i][j] - d[j] - i - j - 1); } } return sol; } int main() { FILE *fin = stdin; FILE *fout = stdout; int i , j , sol , st , dr; fscanf (fin,"%d%d",&n,&m); for (i=1;i<=n;i++){ for (j=1;j<=m;j++){ fscanf (fin,"%d",&a[i][j]); } } sol = solve(); for (i=1;i<=n;i++){ st = 1; dr = m; while (st < dr){ swap(a[i][st] , a[i][dr]); st++; dr--; } } sol = max (sol , solve()); for (i=1;i<=m;i++){ st = 1; dr = n; while (st < dr){ swap(a[st][i] , a[dr][i]); st++; dr--; } } sol = max (sol , solve()); for (i=1;i<=n;i++){ st = 1; dr = m; while (st < dr){ swap(a[i][st] , a[i][dr]); st++; dr--; } } sol = max (sol , solve()); fprintf (fout,"%d",sol); return 0; }

maxcomp.cpp: In function 'int main()':
maxcomp.cpp:29:12: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     fscanf (fin,"%d%d",&n,&m);
     ~~~~~~~^~~~~~~~~~~~~~~~~~
maxcomp.cpp:32:20: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             fscanf (fin,"%d",&a[i][j]);
             ~~~~~~~^~~~~~~~~~~~~~~~~~~