oj.uz

Submission #917947

# Submission time Handle Problem Language Result Execution time Memory
917947 2024-01-29T07:13:12 Z nightfal Ancient Books (IOI17_books) C++14
100 / 100
 102 ms 20108 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);
}

pair<int,int> extend(int l, int r, vector<int>& lmost, vector<int>& rmost) {
    while(l > min(lmost[l],lmost[r]) || r < max(rmost[l],rmost[r])) {
        l=min(l,min(lmost[l],lmost[r])); 
        r=max(r,max(rmost[r],rmost[l]));
    }
    return make_pair(l,r);
} 


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

    int n = p.size();

    // curtail ignorable head and tail.
    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, moveL=0, moveR=0;
    long long totalMoves=0, rMoves=0, lMoves=0, jumps=0;
    for(int i=start; i<=end; i++) jumps += abs(p[i]-i);

    vector<int> lmost(n), rmost(n); 
    l = lmost[s] = min(s,p[s]), r = rmost[s] = max(s,p[s]);
    for(int i=s-1; i>=start; i--) {lmost[i] = min(lmost[i+1],p[i]); rmost[i] = max(rmost[i+1],p[i]);}
    for(int i=s+1; i<=end ; i++) {lmost[i] = min(lmost[i-1],p[i]); rmost[i] = max(rmost[i-1],p[i]);}
    tie(l,r) = extend(l,r,lmost,rmost);
    while(start<l || r<end) {
        // printf("l=%d, r=%d\n",l,r);
        if(r<end && (l<=start || rMoves < lMoves)) {
            r++; rMoves++;
            int l2,r2;
            tie(l2,r2) = extend(l,r,lmost,rmost);
            if (l2<l) {totalMoves += rMoves; rMoves = lMoves = 0;}
            l = l2; r = r2; 
        }
        else {
            l--; lMoves++;
            int l2,r2;
            tie(l2,r2) = extend(l,r,lmost,rmost);
            if (r<r2) {totalMoves += lMoves; rMoves = lMoves = 0;}
            l = l2; r = r2;             
        }
    }
    totalMoves += rMoves + lMoves;
    // printf("totalMoves=%d, jumps=%d\n",totalMoves,jumps);
    return totalMoves*2+jumps;
}

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 'long long int fulltask(std::vector<int>, int)':
books.cpp:80:14: warning: unused variable 'lStart' [-Wunused-variable]
   80 |     int l=s, lStart=s, r=s, rStart=s, moveL=0, moveR=0;
      |              ^~~~~~
books.cpp:80:29: warning: unused variable 'rStart' [-Wunused-variable]
   80 |     int l=s, lStart=s, r=s, rStart=s, moveL=0, moveR=0;
      |                             ^~~~~~
books.cpp:80:39: warning: unused variable 'moveL' [-Wunused-variable]
   80 |     int l=s, lStart=s, r=s, rStart=s, moveL=0, moveR=0;
      |                                       ^~~~~
books.cpp:80:48: warning: unused variable 'moveR' [-Wunused-variable]
   80 |     int l=s, lStart=s, r=s, rStart=s, moveL=0, moveR=0;
      |                                                ^~~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 600 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 0 ms 348 KB Output is correct
14 Correct 0 ms 360 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 344 KB Output is correct
18 Correct 0 ms 344 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 600 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 0 ms 348 KB Output is correct
14 Correct 0 ms 360 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 344 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 600 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 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 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 600 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 0 ms 348 KB Output is correct
14 Correct 0 ms 360 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 344 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 600 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 83 ms 19936 KB Output is correct
31 Correct 85 ms 19940 KB Output is correct
32 Correct 77 ms 19956 KB Output is correct
33 Correct 87 ms 19952 KB Output is correct
34 Correct 102 ms 19792 KB Output is correct
35 Correct 86 ms 19796 KB Output is correct
36 Correct 87 ms 20108 KB Output is correct
37 Correct 88 ms 19940 KB Output is correct
38 Correct 82 ms 19792 KB Output is correct
39 Correct 83 ms 19940 KB Output is correct
40 Correct 80 ms 19952 KB Output is correct
41 Correct 83 ms 19952 KB Output is correct
42 Correct 82 ms 19956 KB Output is correct
43 Correct 86 ms 19936 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 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 1 ms 344 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 0 ms 348 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 388 KB Output is correct
11 Correct 1 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 1 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 1 ms 344 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 600 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 0 ms 348 KB Output is correct
14 Correct 0 ms 360 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 344 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 600 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 83 ms 19936 KB Output is correct
31 Correct 85 ms 19940 KB Output is correct
32 Correct 77 ms 19956 KB Output is correct
33 Correct 87 ms 19952 KB Output is correct
34 Correct 102 ms 19792 KB Output is correct
35 Correct 86 ms 19796 KB Output is correct
36 Correct 87 ms 20108 KB Output is correct
37 Correct 88 ms 19940 KB Output is correct
38 Correct 82 ms 19792 KB Output is correct
39 Correct 83 ms 19940 KB Output is correct
40 Correct 80 ms 19952 KB Output is correct
41 Correct 83 ms 19952 KB Output is correct
42 Correct 82 ms 19956 KB Output is correct
43 Correct 86 ms 19936 KB Output is correct
44 Correct 1 ms 348 KB Output is correct
45 Correct 0 ms 348 KB Output is correct
46 Correct 0 ms 348 KB Output is correct
47 Correct 1 ms 344 KB Output is correct
48 Correct 1 ms 344 KB Output is correct
49 Correct 0 ms 348 KB Output is correct
50 Correct 0 ms 348 KB Output is correct
51 Correct 0 ms 348 KB Output is correct
52 Correct 0 ms 348 KB Output is correct
53 Correct 0 ms 388 KB Output is correct
54 Correct 1 ms 348 KB Output is correct
55 Correct 0 ms 348 KB Output is correct
56 Correct 1 ms 348 KB Output is correct
57 Correct 1 ms 348 KB Output is correct
58 Correct 0 ms 348 KB Output is correct
59 Correct 0 ms 348 KB Output is correct
60 Correct 1 ms 344 KB Output is correct
61 Correct 0 ms 344 KB Output is correct
62 Correct 1 ms 348 KB Output is correct
63 Correct 0 ms 348 KB Output is correct
64 Correct 82 ms 19972 KB Output is correct
65 Correct 84 ms 19792 KB Output is correct
66 Correct 81 ms 19732 KB Output is correct
67 Correct 81 ms 20052 KB Output is correct
68 Correct 9 ms 2136 KB Output is correct
69 Correct 9 ms 2140 KB Output is correct
70 Correct 9 ms 2140 KB Output is correct
71 Correct 8 ms 2360 KB Output is correct
72 Correct 9 ms 2140 KB Output is correct
73 Correct 8 ms 2140 KB Output is correct
74 Correct 89 ms 19792 KB Output is correct
75 Correct 87 ms 19796 KB Output is correct
76 Correct 82 ms 20048 KB Output is correct
77 Correct 82 ms 19952 KB Output is correct
78 Correct 85 ms 19792 KB Output is correct
79 Correct 80 ms 19796 KB Output is correct
80 Correct 75 ms 19952 KB Output is correct
81 Correct 91 ms 19940 KB Output is correct
82 Correct 93 ms 19956 KB Output is correct
83 Correct 84 ms 19796 KB Output is correct
84 Correct 86 ms 19792 KB Output is correct
85 Correct 97 ms 19936 KB Output is correct
86 Correct 83 ms 19988 KB Output is correct
87 Correct 85 ms 19796 KB Output is correct
88 Correct 85 ms 19796 KB Output is correct
89 Correct 84 ms 19956 KB Output is correct
90 Correct 82 ms 19952 KB Output is correct
91 Correct 81 ms 19980 KB Output is correct
92 Correct 82 ms 19948 KB Output is correct