oj.uz

Submission #917855

# Submission time Handle Problem Language Result Execution time Memory
917855 2024-01-29T02:07:20 Z nightfal Ancient Books (IOI17_books) C++14
50 / 100
 103 ms 42580 KB 
#include <cstdio>
#include <vector>
#include <cassert>
#include <cstdlib>
#include <tuple>
#include <climits>

using namespace std;

bool isSubtask3(int s) {return s==0;}
bool isSubtask4(int n) {return n<=1000;}

long long subtask3(vector<int> p, int s = 0, int e = -1 , int dir = 1) {
    int n = p.size(), last = s;
    if (e==-1) e = n-1;
    long long total = 0;

    for(int i=s; dir==1 && i<=e || dir==-1 && i>=e; i += dir) {
        if (i==p[i]) continue;
        if (dir*(i-last) > 0) total += abs(i-last)*2;
        total += abs(p[i]-i);
        last = dir==1? max(last,p[i]):min(last,p[i]);
    }
	return total;
}

long long cal(vector<int> p, int l, int r, int lmost, int rmost, vector<vector<long long>>& dp) {
    if (dp[l][r]!=LLONG_MAX) return dp[l][r];
    int n = p.size(); 
    long long temp1=LLONG_MAX, temp2=LLONG_MAX;
    if (l>0) {
        temp1 = abs(p[l-1]-(l-1)); if(l-1 < lmost) temp1 += 2;
        int lmostN = min(lmost,min(l-1,p[l-1])), rmostN = max(rmost,p[l-1]);
        temp1 += cal(p,l-1,r,lmostN,rmostN,dp); 
    }
    if (r<n-1) {
        temp2 = abs(p[r+1]-(r+1)); if(r+1 > rmost) temp2 += 2;
        int lmostN = min(lmost,p[r+1]), rmostN = max(rmost,max(r+1,p[r+1]));
        temp2 += cal(p,l,r+1,lmostN,rmostN,dp); 
    }
    dp[l][r] = min(temp1,temp2);
    return dp[l][r];
}

long long subtask4(vector<int> p, int s) {
    int n = p.size();
    // long long move = 0;
    
    int start; for(start = 0; start < s; start++) if(start!=p[start]) break;
    int end; for(end = n-1; end > s; end--) if(end!=p[end]) break;
    for(int i = 0; i <= end-start; i++) p[i] = p[i+start]-start;
    s -= start; n = end-start+1; p.resize(n); 
    vector<vector<long long>> dp(n,vector<long long>(n,LLONG_MAX));
    dp[0][n-1]=0;

    int l=s, r=s, lmost = min(s,p[s]), rmost = max(s,p[s]);
    return cal(p,l,r,lmost,rmost,dp)+abs(p[s]-s);
}

tuple<int,int,long long> extend(vector<int> p, int l, int r, int lmost, int rmost, int move) {
    int n = p.size();
    while(l> lmost || r < rmost) {
        int idx;
        if (l > max(lmost,0)) idx == --l;
        else if (r < min(rmost,n-1)) idx == ++r;
        move += abs(p[idx]-idx);
        lmost = min(lmost,p[idx]); 
        rmost = max(rmost,p[idx]);
    }
    return make_tuple(l,r,move);
} 

long long fulltask(vector<int> p, int s) {

    int n = p.size();

    int start; for(start = 0; start < s; start++) if(start!=p[start]) break;
    int end; for(end = n-1; end > s; end--) if(end!=p[end]) break;
    for(int i = 0; i <= end-start; i++) p[i] = p[i+start]-start;
    s -= start; n = end-start+1; p.resize(n); 
    // printf("s=%d, n=%d\n",s,n);

    int l=s, lStart=s, r=s, rStart=s;
    long long total=abs(p[s]-s), moveL=0, moveR=0, totalMove=0;

    vector<long long> sumL(n), sumR(n);
    for(int i=s-1; i>=0; i--) sumL[i] = sumL[i+1] + abs(p[i]-i);
    for(int i=s+1; i<n ; i++) sumR[i] = sumR[i-1] + abs(p[i]-i);

    vector<int> lmost(n), rmost(n); 
    lmost[s] = min(s,p[s]), rmost[s] = max(s,p[s]);
    for(int i=s-1; i>=0; i--) {lmost[i] = min(lmost[i+1],p[i]); rmost[i] = max(rmost[i+1],p[i]);}
    for(int i=s+1; i<n ; i++) {lmost[i] = min(lmost[i-1],p[i]); rmost[i] = max(rmost[i-1],p[i]);}

    while(0<l || r<n-1) {
        // printf("total=%d, moveL=%d, moveR=%d\n",total,moveL,moveR);
        // printf("l=%d, r=%d, lStart=%d, rStart=%d, lmost[%d]=%d, rmost[%d]=%d\n",l,r,lStart,rStart,l,lmost[l],r,rmost[r]);

        if(r < n-1 && (l <= 0 || moveR < moveL || moveR == moveL && r < rmost[r])) {
            if(rmost[r] <= r) moveR++;
            r++;
            // printf("r=%d, moveR=%d, lStart=%d, lmost[%d]=%d\n",r,moveR,lStart,r,lmost[r]);
            if (lmost[r] < lStart) {
                total+=sumR[r]-sumR[rStart]+sumL[lmost[r]]-sumL[lStart]+moveR*2; 
                totalMove += 2*moveR;
                // printf("total=%d, sumR[%d]=%d, sumL[lmost[%d]]=%d, sumL[lStart]=%d\n",total, r, sumR[r], r, sumL[lmost[r]], sumL[lStart]);
                moveR=0; moveL=0; 
                rStart=r; l=lStart=lmost[r];
                // printf("l=%d, r=%d, lStart=%d, rStart=%d\n",l,r,lStart,rStart);
            }
        } 
        else if(0 < l && (r >= n-1 || moveR > moveL || moveR == moveL && r >= rmost[r])) {
            if (l <= lmost[l]) moveL++;
            l--;
            // printf("l=%d, moveL=%d, rStart=%d, rmost[%d]=%d\n",l,moveL,rStart,l,rmost[l]);
            if (rStart < rmost[l]) {
                total+=sumL[l]-sumL[lStart]+sumR[rmost[l]]-sumR[rStart]+moveL*2; 
                totalMove += 2*moveL;
                // printf("total=%d, sumL[%d]=%d, sumR[rmost[%d]]=%d, sumR[rStart]=%d\n",total, l, sumL[l], l, sumR[rmost[l]], sumR[rStart]);
                moveR=0; moveL=0; 
                lStart=l, r=rStart=rmost[l];
                // printf("l=%d, r=%d, lStart=%d, rStart=%d\n",l,r,lStart,rStart);
            }            
        }
        // printf("\n");
    }
    // printf("total=%d, moveL=%d, moveR=%d\n",total,moveL,moveR);
    // printf("l=%d, r=%d, lmost[%d]=%d, rmost[%d]=%d\n",l,r,l,lmost[l],r,rmost[r]);
 
    // total += sumL + moveL*2; 
    // total += sumR + moveR*2;
    totalMove += 2*(moveL+moveR);
    // printf("totalMove=%d, sumL[0]=%d, sumR[%d]=%d \n",totalMove,sumL[0],n-1,sumR[n-1]);
    return totalMove+sumL[0]+sumR[n-1]+abs(p[s]-s);
}

long long minimum_walk(std::vector<int> p, int s) {
    // if (isSubtask3(s)) return subtask3(p);
    // if (isSubtask4(s)) return subtask4(p,s);
    return fulltask(p,s);
}

Compilation message

books.cpp: In function 'long long int subtask3(std::vector<int>, int, int, int)':
books.cpp:18:25: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   18 |     for(int i=s; dir==1 && i<=e || dir==-1 && i>=e; i += dir) {
      |                  ~~~~~~~^~~~~~~
books.cpp: In function 'std::tuple<int, int, long long int> extend(std::vector<int>, int, int, int, int, int)':
books.cpp:64:35: warning: value computed is not used [-Wunused-value]
   64 |         if (l > max(lmost,0)) idx == --l;
      |                               ~~~~^~~~~~
books.cpp:65:42: warning: value computed is not used [-Wunused-value]
   65 |         else if (r < min(rmost,n-1)) idx == ++r;
      |                                      ~~~~^~~~~~
books.cpp: In function 'long long int fulltask(std::vector<int>, int)':
books.cpp:99:66: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   99 |         if(r < n-1 && (l <= 0 || moveR < moveL || moveR == moveL && r < rmost[r])) {
books.cpp:112:71: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  112 |         else if(0 < l && (r >= n-1 || moveR > moveL || moveR == moveL && r >= rmost[r])) {
books.cpp: In function 'std::tuple<int, int, long long int> extend(std::vector<int>, int, int, int, int, int)':
books.cpp:66:26: warning: 'idx' is used uninitialized in this function [-Wuninitialized]
   66 |         move += abs(p[idx]-idx);
      |                          ^

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 424 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 344 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 0 ms 348 KB Output is correct

Subtask #3
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 424 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 344 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 89 ms 42192 KB Output is correct
31 Correct 103 ms 42320 KB Output is correct
32 Correct 79 ms 18644 KB Output is correct
33 Correct 97 ms 42208 KB Output is correct
34 Correct 96 ms 42192 KB Output is correct
35 Correct 93 ms 42328 KB Output is correct
36 Correct 94 ms 42324 KB Output is correct
37 Correct 98 ms 42320 KB Output is correct
38 Correct 94 ms 42580 KB Output is correct
39 Correct 92 ms 42208 KB Output is correct
40 Correct 92 ms 42228 KB Output is correct
41 Correct 92 ms 42320 KB Output is correct
42 Correct 98 ms 42320 KB Output is correct
43 Correct 92 ms 42192 KB Output is correct

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB 3rd lines differ - on the 1st token, expected: '3304', found: '3308'
2 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 424 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 344 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 89 ms 42192 KB Output is correct
31 Correct 103 ms 42320 KB Output is correct
32 Correct 79 ms 18644 KB Output is correct
33 Correct 97 ms 42208 KB Output is correct
34 Correct 96 ms 42192 KB Output is correct
35 Correct 93 ms 42328 KB Output is correct
36 Correct 94 ms 42324 KB Output is correct
37 Correct 98 ms 42320 KB Output is correct
38 Correct 94 ms 42580 KB Output is correct
39 Correct 92 ms 42208 KB Output is correct
40 Correct 92 ms 42228 KB Output is correct
41 Correct 92 ms 42320 KB Output is correct
42 Correct 98 ms 42320 KB Output is correct
43 Correct 92 ms 42192 KB Output is correct
44 Incorrect 0 ms 344 KB 3rd lines differ - on the 1st token, expected: '3304', found: '3308'
45 Halted 0 ms 0 KB -