Submission #549724

#TimeUsernameProblemLanguageResultExecution timeMemory
549724PherokungThe Kingdom of JOIOI (JOI17_joioi)C++14
100 / 100
2734 ms83192 KiB
#include<bits/stdc++.h> using namespace std; #define N 2005 #define F first #define S second #define ll long long ll n,m,a[N][N],b[N][N],ans=2e9; bool cal(ll n,ll m,ll v){ bitset<N> dp[N]; for(int i=0;i<=n;i++) dp[i] = 1; for(int i=0;i<=m;i++) dp[n+1][i] = true; for(int i=n;i>0;i--) for(int j=1;a[i][j]<=v&&dp[i+1][j]&&dp[i][j-1];j++) dp[i][j]=true; if(!dp[n][1]) return false; if(dp[1][m]) return true; ll mn[2], mx[2]; mn[0] = mn[1] = 1e9; mx[0] = mx[1] = 0; for(int i=1;i<=n;i++){ for(int j=1;j<=m;j++){ mn[dp[i][j]]=min(mn[dp[i][j]],a[i][j]); mx[dp[i][j]]=max(mx[dp[i][j]],a[i][j]); } } // printf(">> %d : %d %d %d %d\n",v,mx1,mn1,mx0,mn0); ans = min(ans,max(mx[0]-mn[0],mx[1]-mn[1])); if(mn[1] >= mn[0]) return false; return mx[1]-mn[1] > mx[0]-mn[0]; } void sol(ll n,ll m){ ll be = 0,ed = 1e9; while(be <= ed){ ll mid = (be+ed)/2; if(cal(n,m,mid)) ed = mid-1; else be = mid+1; } } int main(){ scanf("%lld%lld",&n,&m); for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) scanf("%lld",&a[i][j]); sol(n,m); for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) b[i][j] = a[i][j]; for(int i=1;i<=m;i++) for(int j=1;j<=n;j++) a[i][j] = b[n-j+1][i]; sol(m,n); for(int i=1;i<=m;i++) for(int j=1;j<=n;j++) b[i][j] = a[i][j]; for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) a[i][j] = b[m-j+1][i]; sol(n,m); for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) b[i][j] = a[i][j]; for(int i=1;i<=m;i++) for(int j=1;j<=n;j++) a[i][j] = b[n-j+1][i]; sol(m,n); printf("%lld",ans); } /* 4 4 1 12 6 11 11 10 2 14 10 1 9 20 4 17 19 10 3 4 1 1 1 1 1 1 9 2 2 2 2 2 3 4 2 2 2 2 9 2 1 1 1 1 1 1 */

Compilation message (stderr)

joioi.cpp: In function 'int main()':
joioi.cpp:46:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |  scanf("%lld%lld",&n,&m);
      |  ~~~~~^~~~~~~~~~~~~~~~~~
joioi.cpp:47:51: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |  for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) scanf("%lld",&a[i][j]);
      |                                              ~~~~~^~~~~~~~~~~~~~~~~
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...