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CSES - HIIT Open 2018

HIIT Open 2018

Contest start:2018-05-26 11:00:00
Contest end:2018-05-26 16:00:00

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History
2018-05-26 15:59:55
2018-05-26 15:59:35
2018-05-26 15:58:39
2018-05-26 15:58:18
2018-05-26 15:57:50
2018-05-26 15:56:41
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2018-05-26 15:55:33
2018-05-26 15:55:21
2018-05-26 15:54:56
2018-05-26 15:54:14
2018-05-26 15:53:49
2018-05-26 15:53:22
2018-05-26 15:53:02
2018-05-26 15:52:35
2018-05-26 15:52:14
2018-05-26 15:51:30
2018-05-26 15:50:43
2018-05-26 15:49:21
2018-05-26 15:48:47
2018-05-26 15:48:17
2018-05-26 15:47:53
2018-05-26 15:47:26
2018-05-26 15:46:54
2018-05-26 15:46:05
2018-05-26 15:45:39
2018-05-26 15:45:21
2018-05-26 15:44:18
2018-05-26 15:42:24
2018-05-26 15:41:47
2018-05-26 15:41:23
2018-05-26 15:40:59
2018-05-26 15:40:26
2018-05-26 15:40:02
2018-05-26 15:39:26
2018-05-26 15:37:15
2018-05-26 15:28:04
Task:Euclidean Geometry
Sender:Puhi~
Submission time:2018-05-26 15:59:55
Status:READY
Result:RUNTIME ERROR

Show test data

Compiler report

input/code.cpp: In function 'void solvaa()':
input/code.cpp:74:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < normals.size(); i++) {
                         ~~^~~~~~~~~~~~~~~~
input/code.cpp:85:19: warning: division by zero [-Wdiv-by-zero]
         cout << 1 / 0;
                 ~~^~~

Code

#include <iostream>
#include <vector>
#include <cmath>

using namespace std;


bool image[110][110];

bool is_edge(int ox, int oy) {
    if (!image[ox][oy]) {
        return false;
    }
    
    for (int x = -1; x <= 1; x++) {
        for (int y = -1; y <= 1; y++) {
            if (!image[ox+x][oy+y]) { return true; }
        }
    }
    
    return false;
}

float normal(int ox, int oy) {
    
    float dx = 0;
    float dy = 0;
    
    for (int x = -4; x <= 4; x++) {
        for (int y = -4; y <= 4; y++) {
            if (x == 0 && y == 0) {continue;}
            if (image[ox+x][oy+y]) {
                float l = sqrt(x*x + y*y);
                if (l > 4) { continue; }
                float nx = x / l;
                float ny = y / l;
                dx += nx;
                dy += ny;
            }
        }
    }
    //cout << dy << ' ' << dx << endl;
    //cout << dy << ' ' << dx << ' ' << atan2(dy, dx) << endl;
    return atan2(dy, dx);
}

void solvaa() {
    for (int x = 0; x < 100; x++) {
        for (int y = 0; y < 100; y++) {
            char tmp;
            cin >> tmp;
            image[x+5][y+5] = ('1' == tmp);
        }
    }
    
    vector<float> normals;
    
    for (int x = 0; x < 100; x++) {
        for (int y = 0; y < 100; y++) {
            if (is_edge(x+5, y+5)) {
                normals.push_back(normal(x+5,y+5));
            }
        }
    }
    
    int sivut = 0;
    
    float pi = 3.141592;

    float vs = 0.01;
    
    for (float dir = -3*pi; dir < 3*pi; dir += vs/10) {
        int count = 0;
        for (int i = 0; i < normals.size(); i++) {
            if(abs(dir-normals[i]) < vs/2) { count++; }
        }
        
        if (count > 10) {
            sivut++;
            dir += 0.4;
        }
    }
    
    if(sivut > 4){
        cout << 1 / 0;
    }
    
    /*if(sivut < 3){
        cout << *(int*)0;
    }*/
    
    cout << sivut << endl;
}

int main() {
    int t;
    cin >> t;
    for (int i = 0; i < t; i++) {
        solvaa();
    }
}