Submission #52572

#	Time	Username	Problem	Language	Result	Execution time	Memory
52572		tlwpdus	Pinball (JOI14_pinball)	C++11	100 / 100	265 ms	15932 KiB

pinball

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int,int> pii;

const ll INF = 1LL<<55;

struct segtree {
    int key = 524288;
    ll tree[1050000];
    void init() {
        int i;
        for (i=0;i<2*key;i++) tree[i] = INF;
    }
    void upd(int idx, ll v) {
        idx += key;
        while(idx) {
            tree[idx] = min(tree[idx],v);
            idx/=2;
        }
    }
    ll getv(int s, int e) {
        s += key; e += key;
        ll val = INF;
        while(s<=e) {
            if (s&1) val = min(val,tree[s++]);
            if (~e&1) val = min(val,tree[e--]);
            s/=2; e/=2;
        }
        return val;
    }
} st;

int m, n;
ll A[100100], B[100100], C[100100], D[100100], L[100100], R[100100];
vector<ll> comp;

int main() {
    int i;

    scanf("%d%d",&m,&n);
    for (i=0;i<m;i++) scanf("%lld%lld%lld%lld",&A[i],&B[i],&C[i],&D[i]);
    for (i=0;i<m;i++) {
        comp.push_back(A[i]);
        comp.push_back(B[i]);
        comp.push_back(C[i]);
    }
    comp.push_back(1); comp.push_back(n);
    sort(comp.begin(),comp.end());
    comp.erase(unique(comp.begin(),comp.end()),comp.end());
    for (i=0;i<m;i++) {
        A[i] = lower_bound(comp.begin(),comp.end(),A[i])-comp.begin();
        B[i] = lower_bound(comp.begin(),comp.end(),B[i])-comp.begin();
        C[i] = lower_bound(comp.begin(),comp.end(),C[i])-comp.begin();
    }
    st.init();
    st.upd(0,0);
    for (i=0;i<m;i++) st.upd(C[i],L[i] = st.getv(A[i],B[i])+D[i]);
    st.init();
    st.upd((int)comp.size()-1,0);
    for (i=0;i<m;i++) st.upd(C[i],R[i] = st.getv(A[i],B[i])+D[i]);
    ll res = INF;
    for (i=0;i<m;i++) res = min(res,L[i]+R[i]-D[i]);
    if (res>INF-1000) printf("-1\n");
    else printf("%lld\n",res);

    return 0;
}

Compilation message (stderr)

pinball.cpp: In function 'int main()':
pinball.cpp:43:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&m,&n);
     ~~~~~^~~~~~~~~~~~~~
pinball.cpp:44:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for (i=0;i<m;i++) scanf("%lld%lld%lld%lld",&A[i],&B[i],&C[i],&D[i]);
                       ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 18 / 18
• Subtask 3: 22 / 22
• Subtask 4: 49 / 49