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大废题//============================================================================
// Name : main1163.cpp
// Author :
// Version :
// Copyright : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================
#include <iostream>
using namespace std;
int mx(int a, int b){
if(a < b) return b;
return a;
}
int main() {
int triangle[101][101];
int ceng;
cin >> ceng;
for(int i = 1; i <= ceng; i++){
for(int j = 0; j < i; j++){
cin >> triangle[i-1][j];
}
}
int res[101][101];
for(int i = 0; i < ceng; i++){
res[ceng-1][i] = triangle[ceng-1][i];
}
for(int i = ceng-2; i >= 0; i--){
for(int j = 0; j <= i; j++){
res[i][j] = triangle[i][j] + mx(res[i+1][j], res[i+1][j+1]);
}
}
cout << res[0][0] << endl;
//cout << "!!!Hello World!!!" << endl; // prints !!!Hello World!!!
return 0;
}
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