Submission #105501

#	Time	Username	Problem	Language	Result	Execution time	Memory
105501		onjo0127	Pinball (JOI14_pinball)	C++11	100 / 100	323 ms	14260 KiB

pinball

#include <bits/stdc++.h>
using namespace std;

const long long INF = 1LL * 1e18;

vector<int> S;
int A[100009], B[100009], C[100009], D[100009];
long long lm[100009], rm[100009];

struct segtree {
    vector<long long> T;
    segtree(int N) {
        T.resize(4*N, 0);
    }
    void upd(int idx, int s, int e, int x, long long y) {
        if(x < s || e < x) return;
        if(s == e) {
            T[idx] = y;
            return;
        }
        int m = s+e >> 1;
        upd(idx*2, s, m, x, y);
        upd(idx*2+1, m+1, e, x, y);
        T[idx] = min(T[idx*2], T[idx*2+1]);
    }
    long long mn(int idx, int s, int e, int l, int r) {
        if(r < s || e < l) return INF;
        if(l <= s && e <= r) return T[idx];
        int m = s+e >> 1;
        return min(mn(idx*2, s, m, l, r), mn(idx*2+1, m+1, e, l, r));
    }
};

int main() {
    int M, N; scanf("%d%d",&M,&N);
    for(int i=1; i<=M; i++) {
        scanf("%d%d%d%d",&A[i],&B[i],&C[i],&D[i]);
        S.push_back(C[i]);
    } S.push_back(1); S.push_back(N);
    sort(S.begin(), S.end());
    S.resize(unique(S.begin(), S.end()) - S.begin());

    long long ans = INF;
    int sz = S.size();
    segtree lseg(sz), rseg(sz);
    for(int i=1; i<sz; i++) {lseg.upd(1, 0, sz-1, i, INF); lm[i] = INF;}
    for(int i=0; i<sz-1; i++) {rseg.upd(1, 0, sz-1, i, INF); rm[i] = INF;}
    for(int i=1; i<=M; i++) {
        int l = lower_bound(S.begin(), S.end(), A[i]) - S.begin();
        int r = lower_bound(S.begin(), S.end(), B[i]+1) - S.begin() - 1;
        int x = lower_bound(S.begin(), S.end(), C[i]) - S.begin();
        long long lmn = lseg.mn(1, 0, sz-1, l, r);
        long long rmn = rseg.mn(1, 0, sz-1, l, r);
        ans = min(ans, lmn + rmn + D[i]);
        lm[x] = min(lm[x], lmn + D[i]);
        rm[x] = min(rm[x], rmn + D[i]);
        lseg.upd(1, 0, sz-1, x, lm[x]);
        rseg.upd(1, 0, sz-1, x, rm[x]);
    }
    if(ans == INF) puts("-1");
    else printf("%lld", ans);
    return 0;
}

Compilation message (stderr)

pinball.cpp: In member function 'void segtree::upd(int, int, int, int, long long int)':
pinball.cpp:21:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         int m = s+e >> 1;
                 ~^~
pinball.cpp: In member function 'long long int segtree::mn(int, int, int, int, int)':
pinball.cpp:29:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         int m = s+e >> 1;
                 ~^~
pinball.cpp: In function 'int main()':
pinball.cpp:35:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     int M, N; scanf("%d%d",&M,&N);
               ~~~~~^~~~~~~~~~~~~~
pinball.cpp:37:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d%d%d",&A[i],&B[i],&C[i],&D[i]);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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