Submission #153864

#	Time	Username	Problem	Language	Result	Execution time	Memory
153864		georgerapeanu	Pinball (JOI14_pinball)	C++11	0 / 100	20 ms	16248 KiB

pinball

#include <cstdio>
#include <map>
#include <iostream>

using namespace std;

const int NMAX = 1e5;
const int LEAFS = 3e5;
const long long inf = 1e17;
int n,k;
int a[NMAX + 5];
int b[NMAX + 5];
int c[NMAX + 5];
int d[NMAX + 5];

map<int,int> to_norm;
long long cost[NMAX + 5];
long long cost2[NMAX + 5];


long long aint[2 * LEAFS + 5];

void reset(){
    for(int i = 1;i <= 4 * LEAFS;i++){
        aint[i] = inf;
    } 
}

void update(int pos,long long val){
    pos += LEAFS;
    for(aint[pos] = min(aint[pos],val);pos > 1;(pos >>= 1)){
        aint[pos >> 1] = min(aint[pos >> 1],val);
    }
}

long long query(int l,int r){
    long long ans = inf;
    r++;

    for(l += LEAFS,r += LEAFS;l < r;(l >>= 1),(r >>= 1)){
        if(l & 1)ans = min(ans,aint[l++]);
        if(r & 1)ans = min(ans,aint[--r]);
    }

    return ans;
}

int main(){

    scanf("%d %d",&k,&n);

    for(int i = 1;i <= k;i++){
        scanf("%d %d %d %d",&a[i],&b[i],&c[i],&d[i]);
        to_norm[a[i]] = 1;
        to_norm[b[i]] = 1;
        to_norm[c[i]] = 1;
    }

    to_norm[1] = 1;
    to_norm[n] = 1;

    int last = 0;
    for(auto &it:to_norm){
        it.second = ++last;    
    }

    reset();
    update(1,0);
    for(int i = 1;i <= k;i++){
        cost[i] = d[i] + query(to_norm[a[i]],to_norm[b[i]]);
        update(to_norm[c[i]],cost[i]);
    }

    reset();
    update(to_norm[n],0);
    for(int i = 1;i <= k;i++){
        cost2[i] = d[i] + query(to_norm[a[i]],to_norm[b[i]]);
        update(to_norm[c[i]],cost2[i]);
    }

    long long ans = inf;

    for(int i = 1;i <= k;i++){
        ans = min(ans,cost[i] + cost2[i] - d[i]);
    }

    printf("%lld\n",(ans == inf ? -1:ans));

    return 0;
}

Compilation message (stderr)

pinball.cpp: In function 'int main()':
pinball.cpp:50:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&k,&n);
     ~~~~~^~~~~~~~~~~~~~~
pinball.cpp:53:14: 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]);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pinball.cpp: In function 'void reset()':
pinball.cpp:25:17: warning: iteration 600004 invokes undefined behavior [-Waggressive-loop-optimizations]
         aint[i] = inf;
         ~~~~~~~~^~~~~
pinball.cpp:24:21: note: within this loop
     for(int i = 1;i <= 4 * LEAFS;i++){
                   ~~^~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 18
• Subtask 3: 0 / 22
• Subtask 4: 0 / 49