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31 lines
514 B
C++
31 lines
514 B
C++
#include <algorithm>
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#include <iostream>
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#include <iomanip>
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#include <cstring>
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#include <cstdio>
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#include <stack>
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#include <ctime>
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#include <cmath>
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#include <queue>
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typedef long long l;
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typedef double d;
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typedef char c;
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using namespace std;
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int n;
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int a[1000][1000];
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int main(){
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cin >>n;
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for(int i=1;i<=n;i++){
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for(int j=1;j<=i*2-1;j++){
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cin >>a[i][j];
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}
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}
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for(int i=n;i>=1;i--){
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for(int j=1;j<=i*2-1;j++){
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a[i][j]+=min(min(a[i+1][j],a[i+1][j+1]),a[i+1][j+2]);
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}
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}
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cout <<a[1][1];
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return 0;
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}
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