oj.uz

Submission #588852

# Submission time Handle Problem Language Result Execution time Memory
588852 2022-07-04T06:36:17 Z 반딧불(#8402) Sightseeing in Kyoto (JOI22_kyoto) C++17
0 / 100
 1 ms 724 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

struct vector2{
    ll x, y;
    int i;
    vector2(){}
    vector2(ll x, ll y): x(x), y(y){}
    vector2(ll x, ll y, int i): x(x), y(y), i(i){}

    vector2 operator-(const vector2 &r)const{
        return vector2(x-r.x, y-r.y);
    }

    ll cross(vector2 r)const{
        return x*r.y - y*r.x;
    }

    bool operator<(const vector2 &r)const{
        return x<r.x;
    }
};

ll ccw(vector2 a, vector2 b){
    return a.cross(b);
}

ll ccw(vector2 a, vector2 b, vector2 c){
    return ccw(b-a, c-a);
}

vector<vector2> hull(vector<vector2> &v){
    sort(v.begin(), v.end());
    sort(v.begin()+1, v.end(), [&](vector2 A, vector2 B){
        return ccw(v[0], A, B) > 0;
    });
    vector<vector2> ret (1, v[0]);
    for(int i=1; i<(int)v.size(); i++){
        while(ret.size() >= 2 && ccw(ret[ret.size()-2], ret.back(), v[i]) <= 0) ret.pop_back();
        ret.push_back(v[i]);
    }
    return ret;
}

void simplify(ll* arr, ll* narr, int &sz, ll* loc){
    vector<vector2> vec;
    for(int i=1; i<=sz; i++) vec.push_back(vector2(i, arr[i], i));
    vec = hull(vec);
    sz = (int)vec.size();
    for(int i=1; i<=sz; i++){
        narr[i] = vec[i-1].y;
        loc[i] = vec[i-1].x;
    }
}

int n, m;
ll ta[100002], tb[100002];
ll a[100002], b[100002];
ll al[100002], bl[100002];
ll dist[2002][2002];

int main(){
    scanf("%d %d", &n, &m);
    for(int i=1; i<=n; i++) scanf("%lld", &ta[i]);
    for(int i=1; i<=m; i++) scanf("%lld", &tb[i]);
    simplify(ta, a, n, al);
    simplify(tb, b, m, bl);
    for(int i=1; i<=n; i++) for(int j=1; j<=m; j++) dist[i][j] = 1e18;
    dist[1][1] = 0;
    for(int i=1; i<=n; i++){
        for(int j=1; j<=m; j++){
            dist[i][j+1] = min(dist[i][j+1], dist[i][j] + a[i] * (bl[j+1]-bl[j]));
            dist[i+1][j] = min(dist[i+1][j], dist[i][j] + b[j] * (al[i+1]-al[i]));
        }
    }
    printf("%lld", dist[n][m]);
}

Compilation message

kyoto.cpp: In function 'int main()':
kyoto.cpp:66:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
kyoto.cpp:67:34: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |     for(int i=1; i<=n; i++) scanf("%lld", &ta[i]);
      |                             ~~~~~^~~~~~~~~~~~~~~~
kyoto.cpp:68:34: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |     for(int i=1; i<=m; i++) scanf("%lld", &tb[i]);
      |                             ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Incorrect 0 ms 340 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Incorrect 1 ms 724 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Incorrect 0 ms 340 KB Output isn't correct
4 Halted 0 ms 0 KB -