Submission #1164284

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Source Code Expand

#include <bits/stdc++.h>
 
using namespace std;

typedef pair<int,int> P;
typedef pair<P,int> PP; 

map<int,int> m[100005],l[100005];
 
int R,C,N,n;

PP G[100005]; 

int c[100005],r[100005],A[100005],X[100005],Y[100005];

const int INF=1000000005;

void dfs(int a,int b){

	if(!l[a][b]) return;

	if(r[a]!=INF&&c[b]!=INF) return;

	if(r[a]==INF&&c[b]!=INF){
  		r[a]=m[a][b]-c[b]; 
  	}
  	if(r[a]!=INF&&c[b]==INF){
  		c[b]=m[a][b]-r[a]; 
  	}
  	if(a-1>=1) dfs(a-1,b); 
  	
  	if(a+1<=R) dfs(a+1,b); 
  	
  	if(b-1>=1) dfs(a,b-1); 
  	
  	if(b+1<=C) dfs(a,b+1); 

  	return;

}
 
int main(){             
  
  cin>>R>>C>>N; 
  
  for(int i=0; i<N; i++) scanf("%d %d %d", &G[i].first.first, &G[i].first.second, &G[i].second);

  sort(G,G+N);

  for(int i=0; i<N; i++){
  	X[i]=G[i].first.first;
  	Y[i]=G[i].first.second;
  	A[i]=G[i].second;
  }

  for(int i=0; i<N; i++){
  	m[X[i]][Y[i]]=A[i];
  	l[X[i]][Y[i]]=1;
  }

  for(int i=0; i<100005; i++){
  	c[i]=INF; r[i]=INF;
  }

  c[Y[0]]=0;

  for(int i=0; i<N; i++){
  	if(Y[i]==Y[0]){
  		r[X[i]]=A[i]; 
  	}
  }

  for(int i=0; i<N; i++){
  	if(r[X[i]]==INF&&c[Y[i]]==INF) continue;
  	if(r[X[i]]==INF||c[Y[i]]==INF) dfs(X[i],Y[i]);
  }

  for(int i=0; i<N; i++){
  	if(r[X[i]]!=INF&&c[Y[i]]!=INF){
  		if(r[X[i]]+c[Y[i]]!=A[i]){
  			cout<<"No"<<endl; return 0;
  		}
  	}
  }

  int x=INF,y=INF; int p,q;

  for(int i=1; i<=R; i++){
  	if(r[i]<x){
  		x=r[i]; p=i;
  	}
  }

  for(int i=1; i<=C; i++){
  	if(c[i]<y){
  		y=c[i]; q=i;
  	}
  }

  if(r[p]+c[q]<0){
  	cout<<"No"<<endl; return 0;
  }

  cout<<"Yes"<<endl;

  //cout<<r[2]<<endl;
  
  return 0;
 
}    

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:46:96: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   for(int i=0; i<N; i++) scanf("%d %d %d", &G[i].first.first, &G[i].first.second, &G[i].second);
                                                                                                ^

Judge Result