Submission #465721

#	Time	Username	Problem	Language	Result	Execution time	Memory
465721		Bidrift	Handcrafted Gift (IOI20_gift)	C++17	10 / 100	277 ms	17144 KiB

gift

#include <iostream>
#include <vector>
#include <set>
#include <cmath>
#include <algorithm>
#include <cctype>
#include <string>
#include <fstream>
#include <list>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <queue>
#include <stack>
#include <iomanip>
#include "gift.h"

#define pb push_back
#define eb emplace_back
#define all(a) a.begin(), a.end()
#define srt(a) sort(all(a));
#define srtc(a,comp) sort(all(a),comp);
#define srtb(a) sort(a.rbegin(),a.rend());
#define boost ios::sync_with_stdio(false); cin.tie(0); cin.tie(0);
using ll = long long;
using namespace std;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<bool> vb;
typedef pair<int,int> ii;
typedef vector<ii> vpi;
const int dx[4][2] = {{0,1}, {0,-1}, {1,0}, {-1,0}}; //right left down up
void setIO(string name = "") { // name is nonempty for USACO file I/O
    ios_base::sync_with_stdio(0); cin.tie(0); // see Fast Input & Output
    // alternatively, cin.tie(0)->sync_with_stdio(0);
    freopen((name+".in").c_str(), "r", stdin); // see Input & Output
    freopen((name+".out").c_str(), "w", stdout);
}


/*void craft(string s){
    cout << s << endl;
}*/
int construct(int n, int r, vi a, vi b, vi x){
    string s;
    for (int i = 0; i < n; i++){
        s.pb('R');
    }
    vi onesA, onesB;
    vpi ones;
    for (int i = 0; i < r; i++) if (x[i] == 1) ones.eb(a[i],b[i]);
    if (!ones.empty()) {
        srt(ones);
        int start = ones[0].first;
        onesA.pb(start);
        int finish = ones[0].second;
        for (int i = 1; i < ones.size(); i++) {
            if (ones[i].first <= finish+1) {
                finish = max(finish, ones[i].second);
            } else {
                onesB.pb(finish);
                onesA.pb(ones[i].first);
                finish = ones[i].second;
            }
        }
        onesB.pb(finish);
    }

    // twos
    vi twosA, twosB;
    vpi twos;
    for (int i = 0; i < r; i++) if(x[i] == 2) twos.eb(a[i],b[i]);
    if (!twos.empty()) {
        srt(twos);

        int start = twos[0].first;
        twosA.pb(start);
        int finish = twos[0].second;
        for (int i = 1; i < twos.size(); i++) {
            if (twos[i].first <= finish+1) {
                finish = max(finish, twos[i].second);
            } else {
                twosB.pb(finish);
                twosA.pb(twos[i].first);
                finish = twos[i].second;
            }
        }
        twosB.pb(finish);
    }
    //for (int  i = 0; i < onesA.size(); i++) cout << onesA[i] << " " << onesB[i] << endl;
    //for (int  i = 0; i < twosA.size(); i++) cout << twosA[i] << " " << twosB[i] << endl;
    int one = 0, two = 0;
    while (one < onesA.size() && two < twosA.size()){
        while (twosA[two] >= onesB[one] && one < onesA.size()){
            one++;
        }
        if (one >= onesA.size()) break;
        if (twosB[two] <= onesB[one] && twosA[two] >= onesA[one]){
     //       cout << two << " " << one << endl;
            return 0;
        }
        two++;
    }
  //  cout << 1;
    one = 0, two = 0;
    int color = 0; // 0 = red, 1 = blue
    for (int i = 0; i < n; i++){
   //     cout << s << endl;
        if (one < onesA.size() && two < twosA.size()){
            while (onesB[one] < i){
                one++;
            }
            while (twosB[two] < i){
                two++;
            }
            if (onesA[one] > i && twosA[two] > i){
                if (color) s[i] = 'B';
                else s[i] = 'R';
                continue;
            }
            if (onesA[one] >= i && twosA[two] <= i && twosB[two] >= i){
                color^=1;
                if (color) s[i] = 'B';
                else s[i] = 'R';
                continue;
            }
            if (onesA[one] < i && onesB[one] >= i){
                s[i] = s[i-1];
                continue;
            }
            continue;
        }
        if (one < onesA.size() || (one >= onesA.size() && two >= twosA.size())){
            while (i > onesB[one] && one < onesA.size()) one++;
            //cout << "h" << endl;
            if (i != 0) s[i] = s[i-1];
            continue;
        }
        if (two < twosA.size()){
            color ^= 1;
            if (color) s[i] = 'B';
            else s[i] = 'R';
        } else {
            if (i != 0){
                s[i] = s[i-1];
            }
        }
    }
    craft(s);
    return 1;
}

/*int main(){
    int n, r; cin >> n >> r;
    vi a(r), b(r), x(r);
    for (int i = 0; i < r; i++){
        cin >> a[i] >> b[i] >> x[i];
    }
    cout << construct(n,r,a,b,x);
    return 0;
}*/

Compilation message (stderr)

gift.cpp: In function 'int construct(int, int, vi, vi, vi)':
gift.cpp:57:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |         for (int i = 1; i < ones.size(); i++) {
      |                         ~~^~~~~~~~~~~~~
gift.cpp:79:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |         for (int i = 1; i < twos.size(); i++) {
      |                         ~~^~~~~~~~~~~~~
gift.cpp:93:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   93 |     while (one < onesA.size() && two < twosA.size()){
      |            ~~~~^~~~~~~~~~~~~~
gift.cpp:93:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   93 |     while (one < onesA.size() && two < twosA.size()){
      |                                  ~~~~^~~~~~~~~~~~~~
gift.cpp:94:48: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   94 |         while (twosA[two] >= onesB[one] && one < onesA.size()){
      |                                            ~~~~^~~~~~~~~~~~~~
gift.cpp:97:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   97 |         if (one >= onesA.size()) break;
      |             ~~~~^~~~~~~~~~~~~~~
gift.cpp:109:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  109 |         if (one < onesA.size() && two < twosA.size()){
      |             ~~~~^~~~~~~~~~~~~~
gift.cpp:109:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  109 |         if (one < onesA.size() && two < twosA.size()){
      |                                   ~~~~^~~~~~~~~~~~~~
gift.cpp:133:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  133 |         if (one < onesA.size() || (one >= onesA.size() && two >= twosA.size())){
      |             ~~~~^~~~~~~~~~~~~~
gift.cpp:133:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  133 |         if (one < onesA.size() || (one >= onesA.size() && two >= twosA.size())){
      |                                    ~~~~^~~~~~~~~~~~~~~
gift.cpp:133:63: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  133 |         if (one < onesA.size() || (one >= onesA.size() && two >= twosA.size())){
      |                                                           ~~~~^~~~~~~~~~~~~~~
gift.cpp:134:42: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  134 |             while (i > onesB[one] && one < onesA.size()) one++;
      |                                      ~~~~^~~~~~~~~~~~~~
gift.cpp:139:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  139 |         if (two < twosA.size()){
      |             ~~~~^~~~~~~~~~~~~~
gift.cpp: In function 'void setIO(std::string)':
gift.cpp:36:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |     freopen((name+".in").c_str(), "r", stdin); // see Input & Output
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
gift.cpp:37:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |     freopen((name+".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 15
• Subtask 3: 0 / 20
• Subtask 4: 0 / 25
• Subtask 5: 0 / 30