Submission #2055993

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Source Code Expand

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

#ifdef DEBUG
#define NDEBUG
#include "cout11.h"
#endif
#undef NDEBUG
#include <cassert>

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> ii;
typedef pair<ll,ll> llll;
typedef pair<double,double> dd;

typedef vector<int> vi;
typedef vector<vector<int>> vvi;
typedef vector<ii> vii;
typedef vector<vector<ii>> vvii;
typedef vector<ll> vll;

#define sz(a)  int((a).size())
#define pb  push_back
#define FOR(var,from,to) for(int var=(from);var<=(to);++var)
#define rep(var,n)  for(int var=0;var<(n);++var)
#define rep1(var,n)  for(int var=1;var<=(n);++var)
#define repC2(vari,varj,n)  for(int vari=0;vari<(n)-1;++vari)for(int varj=vari+1;varj<(n);++varj)
#define ALL(c)  (c).begin(),(c).end()
#define RALL(c)  (c).rbegin(),(c).rend()
#define tr(i,c)  for(auto i=(c).begin(); i!=(c).end(); ++i)
#define found(s,e)  ((s).find(e)!=(s).end())
#define mset(arr,val)  memset(arr,val,sizeof(arr))
#define mid(x,y) ((x)+((y)-(x))/2)
#define IN(x,a,b) ((a)<=(x)&&(x)<=(b))

#define VACANT 'V'
#define MALE   'M'
#define FEMALE 'F'

char buf[256];

int query(int i) {
    printf("%d\n", i);
    fflush(stdout);

    fgets(buf, 255, stdin);
    return (int)buf[0];
}

bool sync(int x, int y, int ax, int ay) {
    if ((x - y) % 2 == 0) {
        return ax == ay;
    } else {
        return ax != ay;
    }
}

int main() {
    fgets(buf, 255, stdin);
    int N = atoi(buf);

    int al = query(0);
    if (al == VACANT) return 0;

    int l=0, h=N;
    int ah = al;

    rep(i, 16) {
        int m = (l+h)/2;
        int am = query(m);
        if (am == VACANT) return 0;

        if (sync(l,m, al,am)) {
            l = m; al = am;
        } else {
            h = m; ah = am;
        }
    }
    for (int m=l+1; m<h; ++m) {
        int am = query(m);
        if (am == VACANT) return 0;
    }

    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int query(int)’:
./Main.cpp:47:27: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]
     fgets(buf, 255, stdin);
                           ^
./Main.cpp: In function ‘int main()’:
./Main.cpp:60:27: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]
     fgets(buf, 255, stdin);
                           ^

Judge Result