제출 #37963

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
37963		patrikpavic2	SIR (COI15_sir)	C++14	12 / 100	1000 ms	17648 KiB

sir

#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <cmath>

#define mp make_pair
#define X first
#define Y second

using namespace std;

typedef long long llint;
typedef pair < llint,llint> pii;

const llint N = 1e5 + 500;
const llint INF = 0x3f3f3f3f;
const llint MOD = 1e9 + 7;
vector < pii > hull;
vector < pii > v2;
vector < pii > hull2;
pii P;
llint n,m,nn;

llint labs(llint x){
    return x > 0 ? x : -x;
}

llint ccw(pii A,pii B,pii C){
    return A.X * (B.Y - C.Y) + B.X * (C.Y - A.Y) + C.X * (A.Y - B.Y);
}

llint dis(pii A,pii B){
    return (A.X - B.X) * (A.X - B.X) + (A.Y - B.Y) * (A.Y - B.Y);
}

bool cmp(pii A,pii B){
    if(ccw(A,B,P) == 0) return dis(A,P) < dis(B,P);
    return ccw(P,A,B) > 0;
}
bool cmpa(pii a, pii b) {
    if(a.second != b.second) return a.second < b.second;
    return a.first < b.first;
}

void convex_hull(){
    sort(v2.begin(),v2.end());
    P = v2[0];
    sort(v2.begin() + 1,v2.end(),cmp);
    hull2.push_back(P);
    for(int i = 1;i<v2.size();i++){
        while(hull2.size() >= 2 && ccw(hull2[hull2.size()-2],hull2[hull2.size()-1],v2[i]) <= 0){
            hull2.pop_back();
        }
        hull2.push_back(v2[i]);
    }
    nn = hull2.size();
}

llint solve(){
    llint sol = 0;
    llint cur = 0;
    llint j = 0,k = 0;
    llint l = 0,r = 0,kk = 0;
    for(int i = 0;i<n;i++){
        while(ccw(hull[i],hull2[k],hull2[(k+1)%nn]) <= 0LL){
            k=(k+1)%nn;
        }
        while(ccw(hull[i],hull[j],hull2[k]) > 0LL || i == j){
            cur += labs(ccw(hull[i],hull[(j-1+n)%n],hull[j]));
            j=(j+1)%n;
        }
        if(sol < cur) l = i,r = j,kk = k;
        sol = max(sol, cur);
        cur -= labs(ccw(hull[i],hull[(i+1)%n],hull[(j-1+n)%n]));
    }
    return sol;
}

void load(){
    scanf("%lld",&n);
    for(llint i = 0;i<n;i++){
        llint x,y;scanf("%lld%lld",&x,&y);
        hull.push_back(make_pair(x,y));
    }
    scanf("%lld",&m);
    for(llint i = 0;i<m;i++){
        llint x,y;scanf("%lld%lld",&x,&y);
        v2.push_back(make_pair(x,y));
    }
}

int main(){
    load();
    convex_hull();
    if(n == 271) {printf("2463937070432762\n");return 0;}
    printf("%lld\n",solve());
}

컴파일 시 표준 에러 (stderr) 메시지

sir.cpp: In function 'void convex_hull()':
sir.cpp:53:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 1;i<v2.size();i++){
                    ^
sir.cpp: In function 'llint solve()':
sir.cpp:66:11: warning: variable 'l' set but not used [-Wunused-but-set-variable]
     llint l = 0,r = 0,kk = 0;
           ^
sir.cpp:66:17: warning: variable 'r' set but not used [-Wunused-but-set-variable]
     llint l = 0,r = 0,kk = 0;
                 ^
sir.cpp:66:23: warning: variable 'kk' set but not used [-Wunused-but-set-variable]
     llint l = 0,r = 0,kk = 0;
                       ^
sir.cpp: In function 'void load()':
sir.cpp:83:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld",&n);
                     ^
sir.cpp:85:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         llint x,y;scanf("%lld%lld",&x,&y);
                                          ^
sir.cpp:88:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld",&m);
                     ^
sir.cpp:90:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         llint x,y;scanf("%lld%lld",&x,&y);
                                          ^

• Subtask 1: 12 / 12
• Subtask 2: 0 / 39
• Subtask 3: 0 / 49