33 lines
586 B
C++
33 lines
586 B
C++
#include <cctype>
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#include <cstdio>
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#include <iostream>
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using namespace std;
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typedef long long ll;
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ll readint(){
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int x=0,w=1;
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char ch=0;
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while(!isdigit(ch)){
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if(ch=='-')w=-1;
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ch=getchar();
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}
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while(isdigit(ch)){
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x=x*10+(ch-'0');
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ch=getchar();
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}
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return x*w;
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}
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int main(){
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const ll n=readint(),m=readint();
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ll ans{};
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for(int i=1;i<=n;i++){
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for(int j=1;j<=m;j++){
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ll num{readint()};
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if(i%3==2&&j%3==2){
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ans+=num;
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}
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}
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}
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printf("%lld",ans);
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} |