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Submission #228652

# Submission time Handle Problem Language Result Execution time Memory
228652 2020-05-02T08:53:52 Z DodgeBallMan Divide and conquer (IZhO14_divide) C++14
100 / 100
 93 ms 8592 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 1e5 + 10;
long long inf = 1e9;
long long n, t[N*4];
long long h[N], sum[N], gold[N], ans;
vector<long long> coord;

int get( int x ) { return lower_bound( coord.begin(), coord.end(), x ) - coord.begin() + 1; }

void build( int l = 1, int r = coord.size(), int idx = 1 ) {
    t[idx] = inf;
    if( l == r ) return ;
    int mid = l + r >> 1;
    build( l, mid, idx<<1 ), build( mid+1, r, idx<<1|1 );
}

void update( int x, long long va, int l = 1, int r = coord.size(), int idx = 1 ) {
    if( l > x || r < x ) return ;
    if( l == r ) return void( t[idx] = min( t[idx], va ) );
    int mid = l + r >> 1;
    update( x, va, l, mid, idx<<1 ), update( x, va, mid+1, r, idx<<1|1 );
    t[idx] = min( t[idx<<1], t[idx<<1|1] );
    return ;
}

long long query( int ll, int rr, int l = 1, int r = coord.size(), int idx = 1 ) {
    if( l > rr || r < ll ) return inf;
    if( l >= ll && r <= rr ) return t[idx];
    int mid = l + r >> 1;
    return min( query( ll, rr, l, mid, idx<<1 ), query( ll, rr, mid+1, r, idx<<1|1 ) );
}

int main()
{
    scanf("%lld",&n);
    for( int i = 1 ; i <= n ; i++ ) {
        scanf("%lld %lld %lld",&h[i],&gold[i],&sum[i]);
        sum[i] += sum[i-1], gold[i] += gold[i-1];
        coord.emplace_back( sum[i-1] - h[i] );
    }
    sort( coord.begin(), coord.end() );
    coord.resize( unique( coord.begin(), coord.end() ) - coord.begin() );
    build();
    /*for( long long i : coord ) printf("%lld ",i);
    printf("\n");*/
    for( int i = 1 ; i <= n ; i++ ) {
        int idx = upper_bound( coord.begin(), coord.end(), sum[i] - h[i] ) - coord.begin(), idx2 = get( sum[i-1] - h[i] );
        update( idx2, ( long long )i );
        long long qu = query( 1, idx );
        //printf("%d %lld\n",i,qu);
        if( qu != inf ) ans = max( ans, gold[i] - gold[qu - 1] );
    }
    printf("%lld",ans);
    return 0;
}

Compilation message

divide.cpp: In function 'void build(int, int, int)':
divide.cpp:16:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid = l + r >> 1;
               ~~^~~
divide.cpp: In function 'void update(int, long long int, int, int, int)':
divide.cpp:23:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid = l + r >> 1;
               ~~^~~
divide.cpp: In function 'long long int query(int, int, int, int, int)':
divide.cpp:32:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid = l + r >> 1;
               ~~^~~
divide.cpp: In function 'int main()':
divide.cpp:38:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld",&n);
     ~~~~~^~~~~~~~~~~
divide.cpp:40:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld %lld %lld",&h[i],&gold[i],&sum[i]);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 4 ms 384 KB Output is correct
6 Correct 4 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 4 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct

Subtask #2
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 4 ms 384 KB Output is correct
6 Correct 4 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 4 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 5 ms 384 KB Output is correct
15 Correct 5 ms 384 KB Output is correct
16 Correct 5 ms 384 KB Output is correct
17 Correct 5 ms 384 KB Output is correct
18 Correct 5 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 5 ms 384 KB Output is correct
21 Correct 6 ms 512 KB Output is correct
22 Correct 6 ms 512 KB Output is correct
23 Correct 9 ms 768 KB Output is correct
24 Correct 10 ms 768 KB Output is correct

Subtask #3
52.0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 4 ms 384 KB Output is correct
6 Correct 4 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 4 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 5 ms 384 KB Output is correct
15 Correct 5 ms 384 KB Output is correct
16 Correct 5 ms 384 KB Output is correct
17 Correct 5 ms 384 KB Output is correct
18 Correct 5 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 5 ms 384 KB Output is correct
21 Correct 6 ms 512 KB Output is correct
22 Correct 6 ms 512 KB Output is correct
23 Correct 9 ms 768 KB Output is correct
24 Correct 10 ms 768 KB Output is correct
25 Correct 8 ms 768 KB Output is correct
26 Correct 11 ms 1152 KB Output is correct
27 Correct 14 ms 1280 KB Output is correct
28 Correct 44 ms 4080 KB Output is correct
29 Correct 47 ms 4336 KB Output is correct
30 Correct 93 ms 8592 KB Output is correct
31 Correct 79 ms 7404 KB Output is correct
32 Correct 81 ms 7532 KB Output is correct
33 Correct 83 ms 7276 KB Output is correct
34 Correct 83 ms 7276 KB Output is correct
35 Correct 90 ms 7784 KB Output is correct
36 Correct 88 ms 7912 KB Output is correct