Submission #1028900

#	Time	Username	Problem	Language	Result	Execution time	Memory
1028900		tolbi	Wombats (IOI13_wombats)	C++17	55 / 100	354 ms	262144 KiB

wombats

#include "wombats.h"
#include <bits/stdc++.h>
using namespace std;
const int MAXR = 5000;
const int MAXC = 100;
const int INF = 1e9;
int H[MAXR][MAXC]={},V[MAXR][MAXC]={};
int dp[MAXR*4][MAXC][MAXC];
int opt[MAXC][MAXC];
int C,R,sz;
void merge(int x){
    if (x*2+1>=sz){
        if (x-sz/2<R){
            for (int i = 0; i < C; i++){
                int somma = 0;
                for (int j = i; j < C; j++){
                    dp[x][i][j]=somma+V[x-sz/2][j];
                    somma+=H[x-sz/2][j];
                }
                somma = 0;
                for (int j = i-1; j >= 0; j--){
                    somma+=H[x-sz/2][j];
                    dp[x][i][j]=somma+V[x-sz/2][j];
                }
            }
        }
        else {
            for (int i = 0; i < C; i++){
                for (int j = 0; j < C; j++){
                    if (i==j) dp[x][i][j]=0;
                    else dp[x][i][j]=INF;
                }
            }
        }
    }
    else {
        for (int i = C-1; i >= 0; i--){
            for (int j = 0; j < C; j++){
                int lbound = 0;
                int rbound = C-1;
                if (j) lbound=opt[i][j-1];
                if (i+1<C) rbound=opt[i+1][j];
                opt[i][j]=lbound;
                dp[x][i][j]=dp[x*2+1][i][lbound]+dp[x*2+2][lbound][j];
                for (int k = lbound; k <= rbound; k++){
                    if (dp[x*2+1][i][k]+dp[x*2+2][k][j]<dp[x][i][j]){
                        dp[x][i][j]=dp[x*2+1][i][k]+dp[x*2+2][k][j];
                        opt[i][j]=k;
                    }
                }
            }
        }
    }
}
void init(int RR, int CC, int HH[5000][200], int VV[5000][200]) {
    C=CC,R=RR;
    sz=(1LL<<((int)(ceil(log2(R)+1))))-1;
    for (int i = 0; i < R; i++){
        for (int j = 0; j < C; j++){
            if (j+1<C) H[i][j]=HH[i][j];
            if (i+1<R) V[i][j]=VV[i][j];
        }
    }
    for (int i = sz-1; i >= 0; i--){
        merge(i);
    }
}

void changeH(int P, int Q, int W) {
    H[P][Q]=W;
    P+=sz/2;
    merge(P);
    while (P){
        P=(P-1)/2;
        merge(P);
    }
}

void changeV(int P, int Q, int W) {
    V[P][Q]=W;
    P+=sz/2;
    merge(P);
    while (P){
        P=(P-1)/2;
        merge(P);
    }
}
int escape(int V1, int V2) {
    return dp[0][V1][V2];
}

Compilation message (stderr)

grader.c: In function 'int main()':
grader.c:15:6: warning: variable 'res' set but not used [-Wunused-but-set-variable]
   15 |  int res;
      |      ^~~

• Subtask 1: 9 / 9
• Subtask 2: 12 / 12
• Subtask 3: 16 / 16
• Subtask 4: 18 / 18
• Subtask 5: 0 / 21
• Subtask 6: 0 / 24