oj.uz

Submission #309821

# Submission time Handle Problem Language Result Execution time Memory
309821 2020-10-04T15:20:14 Z updown1 Automobil (COCI17_automobil) C++17
85 / 100
 25 ms 16000 KB 
/*
Code by @marlov       
*/
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<long long,long long> pi;
 
#define maxV 1000002
#define MOD 1000000007
//const long long MOD=1000000007;
long long N,M,K;
long long sum=0;
unordered_set<long long> cols;
unordered_set<long long> rows;
long long cm[maxV];
long long rm[maxV];
 
long long qsum(long long T,long long s,long long e){
  T %= MOD;
  s %= MOD;
  e %= MOD;
	if(T%2==0) return ((T/2)*(s+e))%MOD;
	else return (((s+e)/2)*(T))%MOD;
}
 
void add(long long v){
	sum+=v;
	sum%=MOD;
	while(sum<0) sum+=MOD;
}
void sub(long long v){
	sum-=v;
	sum%=MOD;
	while(sum<0) sum+=MOD;
}
void mult(long long v){
	sum*=v;
	sum%=MOD;
}
 
int main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	cin>>N>>M>>K;
	fill(cm,cm+maxV,1);
	fill(rm,rm+maxV,1);
	char c;
	long long x,m;
	for(long long i=0;i<K;i++){
		cin>>c>>x>>m;
		x--;
		if(c=='R'){
			rows.insert(x);
			rm[x]*=m;
			rm[x]%=MOD;
		}else if(c=='S'){
			cols.insert(x);
			cm[x]*=m;
			cm[x]%=MOD;
		}
	}
	for(long long i=0;i<N;i++){
		add(rm[i]*(qsum(M,i*M+1,i*M+M)));
		//sum+=MOD;
	}
	//cout<<"1st: "<<sum<<'\n';
	for(long long i:cols){
		//cout<<(qsum(N,i+1,(N-1)*M+i+1))<<'\n';
		add((cm[i]-1)*(qsum(N,i+1,(N-1)*M+i+1)));
		//sum+=MOD;
	}
	//cout<<"2nd: "<<sum<<'\n';
	for(long long i:cols){
		for(long long j:rows){
			long long cv= (M*j+i+1)%MOD;
			sub((cm[i]+rm[j]-1)*cv);
			//sum+=MOD;
          assert(sum >= 0);
			add(((cm[i]*rm[j])%MOD)*cv);
		}
	}
  assert(sum >= 0 && sum < MOD);
	cout<<sum<<'\n';
    return 0;
}
 
/* stuff you should look for
	* long long overflow, array bounds
	* special cases (n=1,n=0?)
	* do smth instead of nothing and stay organized
*/

Subtask #1
85.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 16000 KB Output is correct
2 Correct 10 ms 16000 KB Output is correct
3 Correct 10 ms 16000 KB Output is correct
4 Correct 10 ms 16000 KB Output is correct
5 Correct 10 ms 16000 KB Output is correct
6 Correct 10 ms 16000 KB Output is correct
7 Correct 11 ms 16000 KB Output is correct
8 Correct 10 ms 16000 KB Output is correct
9 Correct 10 ms 16000 KB Output is correct
10 Correct 11 ms 16000 KB Output is correct
11 Incorrect 12 ms 16000 KB Output isn't correct
12 Correct 19 ms 16000 KB Output is correct
13 Incorrect 10 ms 16000 KB Output isn't correct
14 Incorrect 18 ms 16000 KB Output isn't correct
15 Correct 17 ms 16000 KB Output is correct
16 Correct 21 ms 16000 KB Output is correct
17 Correct 21 ms 16000 KB Output is correct
18 Correct 21 ms 16000 KB Output is correct
19 Correct 21 ms 16000 KB Output is correct
20 Correct 25 ms 16000 KB Output is correct