제출 #89237

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
89237		zoomswk	커다란 상품 (IOI17_prize)	C++17	컴파일 에러	0 ms	0 KiB

prize

#include "prize.h"
#include <vector>
#include <algorithm>
using namespace std;

int m, res;
bool flag = false;

int solve(int l, int r, int num, int bef){
    if(num == 0) return;
    if(l > r) return;
    int mid = (l+r)/2;
    vector<int> resp = ask(mid);
    if(resp[0]+resp[1] == 0){
        res = mid;
        flag = true;
        return;
    }
    int b = mid;
    while(resp[0]+resp[1] != m && b < r){
        b++;
        resp = ask(b);
        if(resp[0]+resp[1] == 0){
            res = b;
            flag = true;
            return;
        }
    }
    if(resp[0]+resp[1] == m){
        solve(l, mid-1, resp[0]-(b-mid)-bef, bef);
        if(flag) return;
        solve(b+1, r, num-(resp[0]-bef));
        if(flag) return;
    } else{
        solve(l, mid-1, num, bef);
    }
    return;
}

int find_best(int n) {
    if(n <= 3000){
        for(int i=0; i<n; i++){
            vector<int> resp = ask(i);
            if(resp[0]+resp[1] == 0) return i;
        }
    }
    vector<int> resp;
    for(int i=0; i<500; i++){
        resp = ask(i);
        if(resp[0]+resp[1] == 0) return i;
        m = max(m, resp[0]+resp[1]);
    }
    
    solve(0, n-1, m, 0);
    
    return res;
}

컴파일 시 표준 에러 (stderr) 메시지

prize.cpp: In function 'int solve(int, int, int, int)':
prize.cpp:10:18: error: return-statement with no value, in function returning 'int' [-fpermissive]
     if(num == 0) return;
                  ^~~~~~
prize.cpp:11:15: error: return-statement with no value, in function returning 'int' [-fpermissive]
     if(l > r) return;
               ^~~~~~
prize.cpp:17:9: error: return-statement with no value, in function returning 'int' [-fpermissive]
         return;
         ^~~~~~
prize.cpp:26:13: error: return-statement with no value, in function returning 'int' [-fpermissive]
             return;
             ^~~~~~
prize.cpp:31:18: error: return-statement with no value, in function returning 'int' [-fpermissive]
         if(flag) return;
                  ^~~~~~
prize.cpp:32:40: error: too few arguments to function 'int solve(int, int, int, int)'
         solve(b+1, r, num-(resp[0]-bef));
                                        ^
prize.cpp:9:5: note: declared here
 int solve(int l, int r, int num, int bef){
     ^~~~~
prize.cpp:33:18: error: return-statement with no value, in function returning 'int' [-fpermissive]
         if(flag) return;
                  ^~~~~~
prize.cpp:37:5: error: return-statement with no value, in function returning 'int' [-fpermissive]
     return;
     ^~~~~~