Submission #401714

#	Time	Username	Problem	Language	Result	Execution time	Memory
401714		bonopo	Robots (IOI13_robots)	C++14	Compilation error	0 ms	0 KiB

robots

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
#define pb push_back
#define el "\n"
#define f first
#define s second

typedef long long ll;
const ll MM=1e5+5, MOD=1e9+7;
int A, B, T, x[MM], y[MM], u[MM];
priority_queue<pair<int,int>> pq;

struct toy {
    int wt, sz, idx;
} t[10*MM];

bool cmpw(toy a, toy b) {
    return a.wt<b.wt;
}

bool cmps(toy a, toy b) {
    return a.sz<b.sz;
}

bool check(int sec) {
    memset(u, 0, sizeof(u)); int ptr=1, hv=0;
    // take highest weight you can
    sort(t+1, t+T+1, cmpw);
    for(int i=1; i<=A; ++i) {
        while(ptr<=T&&t[ptr].wt<x[i]) {
            pq.push({t[ptr].sz, ptr++}); }
        int cnt=sec;
        while(!pq.empty()&&cnt) {
            pair<int,int> e=pq.top(); pq.pop();
            if(!u[t[e.s].idx]) {
                u[t[e.s].idx]=1; ++hv; --cnt; }
        }
    }

    sort(t+1, t+T+1, cmps);
    while(!pq.empty()) pq.pop(); ptr=1;
    // take highest size you can
    for(int i=1; i<=B; ++i) {
        while(ptr<=T&&t[ptr].sz<y[i]) {
            pq.push({t[ptr].wt, ptr++}); }
        int cnt=sec;
        while(!pq.empty()&&cnt) {
            pair<int,int> e=pq.top(); pq.pop();
            if(!u[t[e.s].idx]) {
                u[t[e.s].idx]=1; ++hv; --cnt; }
        }
    } return hv==T;
}

int putaway(int _a, int _b, int _t, int X[], int Y[], int W[], int S[]) {
    A=_a; B=_b; T=_t;
    for(int i=0; i<A; ++i) x[i+1]=X[i];
    for(int i=0; i<B; ++i) y[i+1]=Y[i];

    for(int i=0; i<T; ++i) t[i+1].wt=W[i];
    for(int i=0; i<T; ++i) t[i+1].sz=S[i];
    for(int i=0; i<T; ++i) t[i+1].idx=i+1;

    if(A>0) sort(x+1, x+A+1);
    if(B>0) sort(y+1, y+B+1);

    int lo=1, hi=T, mid, ans=-1;
    while(lo<=hi) {
        mid=(lo+hi)/2;
        if(check(mid)) hi=mid-1, ans=mid;
        else lo=mid+1; }
    return ans;
}

Compilation message (stderr)

robots.cpp: In function 'bool check(int)':
robots.cpp:33:36: warning: operation on 'ptr' may be undefined [-Wsequence-point]
   33 |             pq.push({t[ptr].sz, ptr++}); }
      |                                 ~~~^~
robots.cpp:33:36: warning: operation on 'ptr' may be undefined [-Wsequence-point]
robots.cpp:43:5: warning: this 'while' clause does not guard... [-Wmisleading-indentation]
   43 |     while(!pq.empty()) pq.pop(); ptr=1;
      |     ^~~~~
robots.cpp:43:34: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'while'
   43 |     while(!pq.empty()) pq.pop(); ptr=1;
      |                                  ^~~
robots.cpp:47:36: warning: operation on 'ptr' may be undefined [-Wsequence-point]
   47 |             pq.push({t[ptr].wt, ptr++}); }
      |                                 ~~~^~
robots.cpp:47:36: warning: operation on 'ptr' may be undefined [-Wsequence-point]
/usr/bin/ld: /tmp/ccfvhlH1.o: in function `main':
grader.c:(.text.startup+0x1b1): undefined reference to `putaway'
collect2: error: ld returned 1 exit status