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Submission #416528

# Submission time Handle Problem Language Result Execution time Memory
416528 2021-06-02T14:47:05 Z MarcoMeijer Nafta (COI15_nafta) C++14
34 / 100
 1000 ms 135352 KB 
#include <bits/stdc++.h>
using namespace std;

typedef pair<int,int> ii;
typedef long long ll;
typedef pair<int,int> ii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<ll> vll;

#define REP(a,b,c) for(int a=int(b); a<int(c); a++)
#define REV(a,b,c) for(int a=int(c-1); a>=int(b); a--)
#define RE(a,b) REP(a,0,b)
#define RE1(a,b) REP(a,1,b+1)
#define FOR(a,b) for(auto& a : b)
#define pb push_back
#define all(a) a.begin(),a.end()
#define fi first
#define se second

const int INF	= 1e9;
const int MX	= 3000;
const int N	= 1<<22;
const int MOD	= 1e9+7;

int r, s;
char gr[MX][MX];
int dx[]={-1,0,1,0};
int dy[]={0,-1,0,1};

// grid
bool inside(int x, int y) {
  return x>=0&&y>=0&&x<r&&y<s;
}
bool isOil(int x, int y) {
  if(!inside(x,y)) return 0;
  return gr[x][y] != '.';
}

// DSU
int ra[N], p[N], minx[N], maxx[N], sm[N];
void builddsu() {
  RE(x,r) RE(y,s) {
    int i=x+y*r;
    ra[i]=0, p[i]=i, minx[i]=y, maxx[i]=y, sm[i]=0;
    if(gr[x][y] != '.') sm[i]=gr[x][y]-'0';
  }
}
int getSet(int i) {return i==p[i] ? i : p[i]=getSet(p[i]);}
void unionSet(int i, int j) {
  i = getSet(i); j = getSet(j);
  if(i == j) return;
  sm[i] = sm[j] = sm[i]+sm[j];
  minx[i] = minx[j] = min(minx[i], minx[j]);
  maxx[i] = maxx[j] = max(maxx[i], maxx[j]);
  if(ra[i] > ra[j]) {
    p[j]=i;
  } else {
    p[i]=j;
    if(ra[i] == ra[j]) ra[j]++;
  }
}

// daq dp
int cost[MX][MX];
int dp[MX][MX];
void daq(int x, int l, int r, int al, int ar) {
  if(r < l) return;
  int m=(l+r)/2;

  int bsti=al,bstAns=0;
  REP(i,al,ar+1) {
    if(i+1 > m) continue;
    int nAns = dp[i][x-1] + cost[i+1][m];
    if(nAns > bstAns) {
      bstAns = nAns;
      bsti=i;
    }
  }
  dp[m][x] = bstAns;

  daq(x,l,m-1,al,bsti);
  daq(x,m+1,r,bsti,ar);
}

int main() {
  cin>>r>>s;
  RE(i,r) RE(j,s) cin>>gr[i][j];

  builddsu();
  RE(x,r) RE(y,s) RE(d,4) {
    int nx=x+dx[d];
    int ny=y+dy[d];
    if(!isOil(x,y) || !isOil(nx,ny)) continue;
    unionSet(x+y*r, nx+ny*r);
  }

  RE(i,r*s) {
    if(p[i] != i) continue;
    if(!sm[i]) continue;
    cost[minx[i]  ][maxx[i]  ] += sm[i];
    cost[maxx[i]+1][maxx[i]+1] -= sm[i];
  }


  RE(i,s) RE(j,s) {
    if(i)
      cost[i][j] += cost[i-1][j];
    if(j)
      cost[i][j] += cost[i][j-1];
    if(i && j)
      cost[i][j] -= cost[i-1][j-1];
  }

  RE(i,s) {
    dp[i][0] = 0;
    RE(j,i+1) dp[i][0] = max(dp[i][0], cost[j][i]);
  }

  REP(i,1,s) {
    daq(i,0,s-1,0,s-1);
  }

  RE(i,s) cout<<dp[s-1][i]<<endl;
}

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 844 KB Output is correct
2 Correct 1 ms 972 KB Output is correct
3 Correct 1 ms 844 KB Output is correct
4 Correct 1 ms 844 KB Output is correct
5 Correct 1 ms 844 KB Output is correct
6 Correct 1 ms 844 KB Output is correct

Subtask #2
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 844 KB Output is correct
2 Correct 1 ms 972 KB Output is correct
3 Correct 1 ms 844 KB Output is correct
4 Correct 1 ms 844 KB Output is correct
5 Correct 1 ms 844 KB Output is correct
6 Correct 1 ms 844 KB Output is correct
7 Correct 14 ms 6064 KB Output is correct
8 Correct 16 ms 6024 KB Output is correct
9 Correct 17 ms 6004 KB Output is correct
10 Correct 14 ms 6052 KB Output is correct
11 Correct 15 ms 6092 KB Output is correct
12 Correct 16 ms 6120 KB Output is correct

Subtask #3
0 / 66.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 844 KB Output is correct
2 Correct 1 ms 972 KB Output is correct
3 Correct 1 ms 844 KB Output is correct
4 Correct 1 ms 844 KB Output is correct
5 Correct 1 ms 844 KB Output is correct
6 Correct 1 ms 844 KB Output is correct
7 Correct 14 ms 6064 KB Output is correct
8 Correct 16 ms 6024 KB Output is correct
9 Correct 17 ms 6004 KB Output is correct
10 Correct 14 ms 6052 KB Output is correct
11 Correct 15 ms 6092 KB Output is correct
12 Correct 16 ms 6120 KB Output is correct
13 Correct 884 ms 131488 KB Output is correct
14 Correct 980 ms 135300 KB Output is correct
15 Execution timed out 1027 ms 135352 KB Time limit exceeded
16 Halted 0 ms 0 KB -