# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
634144 | Utaha | Prisoner Challenge (IOI22_prison) | C++17 | 0 ms | 0 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "fish.h"
#include <bits/stdc++.h>
using namespace std;
const int maxN = 305;
int n_col = 0;
const int max_height = maxN;
long long dp[maxN][3][max_height + 1];
long long prefix[maxN][max_height + 1];
const long long INF = 1e18;
const int UP = 0;
const int DOWN = 1;
const int STOP = 2;
long long max_weights(int N, int M, std::vector<int> X, std::vector<int> Y,
std::vector<int> W) {
n_col = N + 2;
for(int i = 0; i < M; i++) {
prefix[X[i] + 1][Y[i] + 1] = W[i];
}
for(int i = 0; i < n_col; i++) {
for(int j = 0; j < max_height; j++) {
prefix[i][j + 1] += prefix[i][j];
}
}
// for(int i = 0; i < n_col; i++) {
// for(int j = 0; j < prefix[i].size(); j++) {
// cout << prefix[i][j] << ' ';
// }
// cout<<'\n';
// }
for(int i = 0; i < n_col; i++) {
for(int j = 0; j < 3; j++) {
for(int k = 0; k <= max_height; k++) {
// printf("%d %d %d %lld\n", i, j, k, dp[i][j][k]);
if (i == 0) {
if (j != UP) {
dp[i][j][k] = -INF;
}
else {
dp[i][j][k] = 0;
}
}
if (i == n_col - 1) break;
if (j == UP) {
for(int t = k; t <= max_height; t++) {
dp[i + 1][UP][t] = max(dp[i + 1][UP][t], dp[i][j][k] + prefix[i + 1][t] - prefix[i + 1][k]);
// printf("DEBUG: %d %d %lld\n",i, t, dp[i + 1][UP][t]);
}
if (k == max_height) dp[i + 1][STOP][k] = max(dp[i + 1][STOP][k], dp[i][j][k]);
}
else if(j == STOP) {
if(k != max_height) {
continue;
}
for(int t = 0; t <= k; t++){
dp[i + 1][DOWN][t] = max(dp[i + 1][DOWN][t], dp[i][j][k] + prefix[i + 1][k] - prefix[i + 1][t]);
}
// down and immediately up
// maybe this case doesn't even exist...
for(int t = 0; t <= max_height; t++) {
const int height = max(t, k);
// printf("check: %d %d %lld %lld\n",i, t, dp[i][j][k], prefix[i + 1][height]);
dp[i + 1][UP][t] = max(dp[i + 1][UP][t], dp[i][j][k] + prefix[i + 1][height]);
// printf("DEBU2: %d %d %lld\n",i, t, dp[i + 1][UP][t]);
}
}
else{
for(int t = 0; t <= k; t++) {
dp[i + 1][DOWN][t] = max(dp[i + 1][DOWN][t], dp[i][j][k] + prefix[i + 1][k] - prefix[i + 1][t]);
}
// down and immediately up
// maybe this case doesn't even exist...
for(int t = 0; t <= max_height; t++) {
const int height = max(t, k);
// printf("check: %d %d %lld %lld\n",i, t, dp[i][j][k], prefix[i + 1][height]);
dp[i + 1][UP][t] = max(dp[i + 1][UP][t], dp[i][j][k] + prefix[i + 1][height]);
// printf("DEBU2: %d %d %lld\n",i, t, dp[i + 1][UP][t]);
}
}
}
}
}
return dp[n_col - 1][DOWN][0];
}