Submission #776576

#	Time	Username	Problem	Language	Result	Execution time	Memory
776576		salmon	Fish (IOI08_fish)	C++14	49 / 100	3069 ms	12364 KiB

fish

#include <bits/stdc++.h>
using namespace std;
int N,M;
int mod;
int l,h;
vector<pair<int,int>> v;

int main(){
	scanf(" %d",&N);
	scanf(" %d",&M);
	
	scanf(" %d",&mod);
	
	int mep[500100];
	int mepu[500100];
	bool usable[M + 1];
	
	for(int i = 1; i <= M; i++){
		mep[i] = -1;
		mepu[i] = -1;
	}
	
	for(int i = 0; i <= M; i++) usable[i] = false;
	
	for(int i = 0; i < N; i++){
		scanf(" %d",&l);
		scanf(" %d",&h);
		
		v.push_back(make_pair(l,h));
	}
	
	sort(v.begin(),v.end(),greater<pair<int,int>>());
	
	bool o[500100];
	set<int> smol;
	vector<pair<int,int>> oh;
	
	for(int i = 0; i <= M; i++){
		o[i] = true;
	}
	
	for(int i = 0; i < v.size(); i++){
		if(o[v[i].second]){
			oh.push_back(v[i]);
			o[v[i].second] = false;
		}
	}
	
	int it = 0;
	
	reverse(v.begin(),v.end());

	int bigans = 0;
	
	vector<pair<int,int>> tempuse;
	
	for(int i = 0; i < N; i++){
		while(it != N && v[i].first >= v[it].first * 2){
			if(usable[v[it].second]){
				if(mep[v[it].second] == -1){
					mep[v[it].second] = 1;
				}
				else{
					mep[v[it].second]++;
				}
				
				it++;
			}
			else{
				if(mepu[v[it].second] == -1){
					mepu[v[it].second] = 1;
				}
				else{
					mepu[v[it].second]++;
				}
				
				it++;
			}
		}
		
		if(v[i] == oh.back()){
			
			if(mepu[oh.back().second] != -1){
				mep[oh.back().second] = mepu[oh.back().second];
			}
			
			usable[oh.back().second] = true;
			
			long long int ans = 1;
			
			for(int i = 1; i <= M; i++){
				if(mep[i] != -1){
					ans = ans * (mep[i] + 1) % mod;
				}
			}

 			bigans += ans;
 			bigans %= mod;
 			
 			oh.pop_back();
 			
 			long long int sub = 1;
 			
 			ans = 1;
			for(int j = 0; j < oh.size(); j++){
				if(oh[j].first < v[i].first * 2){
					bool flag = false;
					
					for(int k = it; k < i; k++){
						if(oh[j].first >= v[k].first * 2 && v[k].second == v[i].second) flag = true;
					}
					
					if(flag) continue;
					
					if(mepu[oh[j].second] != -1){
						ans *= (1 + mepu[oh[j].second]);
						ans %= mod;
					}
				}
			}
			
			ans %= mod;
			sub %= mod;
			
			for(int j = 1; j <= M; j++){
				if(mep[j] != -1 && j != v[i].second){
					ans = ans * (mep[j] + 1) % mod;
					sub = sub * (mep[j] + 1) % mod;
				}
			}

 			ans -= sub;
			ans =(ans + mod) % mod;
			bigans += ans;
			bigans %= mod;
			
			//printf("%d %d %d %d\n",v[i].first,bigans,ans,sub);
		}
	}
	
	printf("%d",bigans);
}
/*
 * 
5
3
700
8 3
7 2
4 1
2 3
2 2
* 
 */

Compilation message (stderr)

fish.cpp: In function 'int main()':
fish.cpp:42:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |  for(int i = 0; i < v.size(); i++){
      |                 ~~^~~~~~~~~~
fish.cpp:105:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  105 |    for(int j = 0; j < oh.size(); j++){
      |                   ~~^~~~~~~~~~~
fish.cpp:9:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |  scanf(" %d",&N);
      |  ~~~~~^~~~~~~~~~
fish.cpp:10:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |  scanf(" %d",&M);
      |  ~~~~~^~~~~~~~~~
fish.cpp:12:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |  scanf(" %d",&mod);
      |  ~~~~~^~~~~~~~~~~~
fish.cpp:26:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |   scanf(" %d",&l);
      |   ~~~~~^~~~~~~~~~
fish.cpp:27:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |   scanf(" %d",&h);
      |   ~~~~~^~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 4 / 4
• Subtask 3: 4 / 4
• Subtask 4: 4 / 4
• Subtask 5: 4 / 4
• Subtask 6: 5 / 5
• Subtask 7: 6 / 6
• Subtask 8: 6 / 6
• Subtask 9: 6 / 6
• Subtask 10: 6 / 6
• Subtask 11: 0 / 7
• Subtask 12: 0 / 7
• Subtask 13: 0 / 7
• Subtask 14: 0 / 5
• Subtask 15: 0 / 5
• Subtask 16: 0 / 5
• Subtask 17: 0 / 5
• Subtask 18: 0 / 5
• Subtask 19: 0 / 5