제출 #412399

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
412399		nxteru	Cup of Jamshid (IOI17_cup)	C++14	0 / 100	2 ms	204 KiB

cup

#include "cup.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> find_cup() {
    int sx=-500000000,sy=-500000000;
    int p=ask_shahrasb(sx,sy);
    int x,y;
    for(int i=0;i<29;i++){
        if((p^ask_shahrasb(sx,sy-(1<<i)))>>(i+1)&1)y+=(1<<i);
    }
    int gx=sx,gy=sy;
    if(gy+y-(1<<29)>=-1000000000){
        gy+=y;
        int q=ask_shahrasb(gx,gy);
        if((q^ask_shahrasb(gx,gy-(1<<29)))>>(29+1)&1)y+=(1<<29);
    }else{
        y+=(1<<29);
        gy+=y;
        int q=ask_shahrasb(gx,gy);
        if((q^ask_shahrasb(gx,gy+(1<<29)))>>(29+1)&1)y-=(1<<29);
    }
    vector<int>ans;
    x=p^y;
    ans.push_back(sx+x);
    ans.push_back(sy+y);
    return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

cup.cpp: In function 'std::vector<int> find_cup()':
cup.cpp:9:53: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
    9 |         if((p^ask_shahrasb(sx,sy-(1<<i)))>>(i+1)&1)y+=(1<<i);
      |                                                    ~^~~~~~~~

• Subtask 1: 0 / 100