Submission #960870

#	Time	Username	Problem	Language	Result	Execution time	Memory
960870		hariaakas646	Group Photo (JOI21_ho_t3)	C++14	100 / 100	600 ms	490648 KiB

Main

    #include <bits/stdc++.h>
     
    using namespace std;
     
    #define scd(t) scanf("%d", &t)
    #define sclld(t) scanf("%lld", &t)
    #define forr(i, j, k) for (int i = j; i < k; i++)
    #define frange(i, j) forr(i, 0, j)
    #define all(cont) cont.begin(), cont.end()
    #define mp make_pair
    #define pb push_back
    #define f first
    #define s second
    typedef long long int lli;
    typedef pair<int, int> pii;
    typedef vector<int> vi;
    typedef vector<bool> vb;
    typedef vector<lli> vll;
    typedef vector<string> vs;
    typedef vector<pii> vii;
    typedef vector<vi> vvi;
    typedef map<int, int> mpii;
    typedef set<int> seti;
    typedef multiset<int> mseti;
    typedef long double ld;
     
     
    void usaco()
    {
        freopen("/media/hariaakash646/785EF1075EF0BF46/CompetitiveProgramming/input.in", "r", stdin);
    //    freopen("problem.out", "w", stdout);
    }
     
    int main() {
        // usaco();
        int n;
        scd(n);
     
        vi vec(n+1);
        vi pos(n+1);
     
        forr(i, 1, n+1) {
            scd(vec[i]);
            pos[vec[i]] = i;
        }
     
        vector<vll> val(n+1, vll(n+1));
        vector<vll> val2(n+1, vll(n+1));
        vll pref(n+1);
     
        forr(i, 1, n+1) {
            forr(j, 1, n+1) {
                val[i][j] = val[i][j-1];
                // val2[i][j] = val2[i-1][j];
                if(pos[j] > pos[i]) {
                    val[i][j]++;
                }
            }
            pref[i] = pref[i-1] + val[i][i];
        }
     
        forr(i, 1, n+1) {
            forr(j, 1, n+1) {
                val2[i][j] = val2[i-1][j] + val[i][j];
            }
        }
     
        vvi cost(n+1, vi(n+1));
        forr(i, 1, n+1) {
            forr(j, i, n+1) {
                // forr(k, i, j+1) {
                //     cost[i][j] += val[k][i-1] + val[k][j] - val[k][k];
                // }
                cost[i][j] = val2[j][j] - val2[i-1][j] + val2[j][i-1] - val2[i-1][i-1] - (pref[j] - pref[i-1]); 
            }
        }
     
        vll dp(n+1, 1e17);
        dp[0] = 0;
     
        forr(i, 1, n+1) {
            frange(j, i) {
                dp[i] = min(dp[i], dp[j] + cost[j+1][i]);
            }
        }
        printf("%lld", dp[n]);
    }

Compilation message (stderr)

Main.cpp: In function 'void usaco()':
Main.cpp:30:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |         freopen("/media/hariaakash646/785EF1075EF0BF46/CompetitiveProgramming/input.in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:5:25: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 |     #define scd(t) scanf("%d", &t)
      |                    ~~~~~^~~~~~~~~~
Main.cpp:37:9: note: in expansion of macro 'scd'
   37 |         scd(n);
      |         ^~~
Main.cpp:5:25: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 |     #define scd(t) scanf("%d", &t)
      |                    ~~~~~^~~~~~~~~~
Main.cpp:43:13: note: in expansion of macro 'scd'
   43 |             scd(vec[i]);
      |             ^~~

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 32 / 32
• Subtask 4: 20 / 20
• Subtask 5: 36 / 36