#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
tree<int, null_type, less<int>, rb_tree_tag,
tree_order_statistics_node_update> T;
// #define _GLIBCXX_DEBUG 1
// #define _GLIBCXX_DEBUG_PEDANTIC 1
// #pragma GCC optimize("trapv")
// #define dbg(TXTMSG) cerr << "\n" << TXTMSG
// #define dbgv(VARN) cerr << "\n" << #VARN << " = "<< VARN << ", line: " << __LINE__ << "\n"
#define ld long double
#define int long long
#define forn(i,j) for(int i = 0; i < j; i++)
#define forrange(i,j,k) for(int i = j; i < k; ++i)
#define rof(i,j) rof(int i = j; i >= 0; --i)
#define pii pair<int,int>
#define vi vector<int>
#define vpii vector<pii>
#define vvi vector<vi>
#define vvpii vector<vector<pii>>
#define vb vector<bool>
#define pb push_back
#define p push
#define f first
#define s second
#define all(x) x.begin(), x.end()
#define eb emplace_back
#define qi queue<int>
#define qpii queue<pii>
#define pqpii priority_queue<pii>
#define pqi priority_queue<int>
const int MOD = 1e9 + 7;
const int INF = 1e17 + 1;
const int maxN = 2e5 + 1;
const int L = 2e6 + 1;
void setIO(string name = ""){
ios_base::sync_with_stdio(0);
cin.tie(0);
if(!name.empty()){
freopen((name + ".in").c_str(), "r", stdin);
freopen((name + ".out").c_str(), "w", stdout);
}
}
int w[2001][2001];
int dp[2001][2001];
string grid;
int cst[2001];
bool visited[L];
int n,m;
void floodfill(int st, int t){
queue<int> q;
q.push(st);
while(!q.empty()){
int node = q.front();
q.pop();
if((visited[node]) || (grid[node] == '.')){
continue;
}
visited[node] = true;
cst[t] += grid[node] - '0';
if((node % m != 0)){
if(!visited[node-1]){
q.push(node-1);
}
}
if((node % m != m-1)){
if(!visited[node+1]){
q.push(node+1);
}
}
if((node >= m)){
if(!visited[node-m]){
q.push(node-m);
}
}
if((node < m*(n-1))){
if(!visited[node+m]){
q.push(node+m);
}
}
}
}
vi floodfill2(int st){
queue<int> q;
vb col(m,false);
vb vis(L,false);
vi columns;
q.push(st);
while(!q.empty()){
int node = q.front();
q.pop();
if((vis[node]) || (grid[node] == '.')){
continue;
}
int cj = (node % m);
vis[node] = true;
if(!col[cj]){
columns.pb(cj);
col[cj] = true;
}
if((node % m != 0)){
if(!vis[node-1]){
q.push(node-1);
}
}
if((node % m != m-1)){
if(!vis[node+1]){
q.push(node+1);
}
}
if((node >= m)){
if(!vis[node-m]){
q.push(node-m);
}
}
if((node < m*(n-1))){
if(!vis[node+m]){
q.push(node+m);
}
}
}
return columns;
}
void dnc(int i, int l, int r, int optl, int optr){
if(l > r){
return;
}
int mid = (l+r)/2;
int opt = 1;
dp[mid][i] = 0;
forrange(j,optl,min(mid,optr)+1){
int sum = w[mid][j];
if(dp[mid][i] < dp[j][i-1] + sum){
dp[mid][i] = dp[j][i-1] + sum;
opt = j;
}
}
dnc(i,l,mid-1,optl,opt);
dnc(i,mid+1,r,opt,optr);
}
signed main(){
setIO();
cin >> n >> m;
cin >> grid;
forn(i,n-1){
string s;
cin >> s;
grid = grid + s;
}
int c = 0;
vpii conn_comp;
forn(node,m*n){
if(!visited[node] && (grid[node] != '.')){
floodfill(node,c);
conn_comp.pb({c,node});
c++;
}
}
forn(i,conn_comp.size()){
vi col1 = floodfill2(conn_comp[i].s);
for(int k : col1){
w[k+1][0] += cst[conn_comp[i].f];
forn(j,m){
if(j == k){
continue;
}
if(k > j){
w[k+1][j+1] += cst[conn_comp[i].f];
}
}
}
forn(k,col1.size()){
forn(j,k+1){
if(k == j){
continue;
}
int t1 = col1[k] + 1; int t2 = col1[j] + 1;
if(t1 < t2){
swap(t1,t2);
}
w[t1][t2] -= cst[conn_comp[i].f];
}
}
}
forrange(i,1,m+1){
dnc(i,1,m,0,m-1);
int res = 0;
forrange(j,1,m+1){
res = max(dp[j][i],res);
}
cout << res << endl;
}
}
Compilation message
nafta.cpp: In function 'int main()':
nafta.cpp:19:36: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
19 | #define forn(i,j) for(int i = 0; i < j; i++)
......
202 | forn(i,conn_comp.size()){
| ~~~~~~~~~~~~~~~~~~
nafta.cpp:202:2: note: in expansion of macro 'forn'
202 | forn(i,conn_comp.size()){
| ^~~~
nafta.cpp:19:36: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
19 | #define forn(i,j) for(int i = 0; i < j; i++)
......
218 | forn(k,col1.size()){
| ~~~~~~~~~~~~~
nafta.cpp:218:3: note: in expansion of macro 'forn'
218 | forn(k,col1.size()){
| ^~~~
nafta.cpp: In function 'void setIO(std::string)':
nafta.cpp:49:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
49 | freopen((name + ".in").c_str(), "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
nafta.cpp:50:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
50 | freopen((name + ".out").c_str(), "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
6756 KB |
Output is correct |
| 2 |
Correct |
2 ms |
6756 KB |
Output is correct |
| 3 |
Correct |
1 ms |
6756 KB |
Output is correct |
| 4 |
Correct |
2 ms |
6756 KB |
Output is correct |
| 5 |
Correct |
2 ms |
6756 KB |
Output is correct |
| 6 |
Correct |
1 ms |
6756 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
6756 KB |
Output is correct |
| 2 |
Correct |
2 ms |
6756 KB |
Output is correct |
| 3 |
Correct |
1 ms |
6756 KB |
Output is correct |
| 4 |
Correct |
2 ms |
6756 KB |
Output is correct |
| 5 |
Correct |
2 ms |
6756 KB |
Output is correct |
| 6 |
Correct |
1 ms |
6756 KB |
Output is correct |
| 7 |
Runtime error |
57 ms |
28136 KB |
Execution killed with signal 6 |
| 8 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
6756 KB |
Output is correct |
| 2 |
Correct |
2 ms |
6756 KB |
Output is correct |
| 3 |
Correct |
1 ms |
6756 KB |
Output is correct |
| 4 |
Correct |
2 ms |
6756 KB |
Output is correct |
| 5 |
Correct |
2 ms |
6756 KB |
Output is correct |
| 6 |
Correct |
1 ms |
6756 KB |
Output is correct |
| 7 |
Runtime error |
57 ms |
28136 KB |
Execution killed with signal 6 |
| 8 |
Halted |
0 ms |
0 KB |
- |
