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#include <stdio.h>
#define MAX 15
int max(int i,int j)
{
if (i>j)
return i;
else
return j;
}
int main()
{
int triangle[MAX][MAX];
int answer[MAX][MAX];
int maxtotal=0;
int i,j;
for (i=0; i<MAX; ++i){
for (j=0; j<=i; ++j){
scanf("%d",&triangle[i][j]);
if (i==0){
answer[i][j]=triangle[i][j];
}else if (j==0){
answer[i][j]=
triangle[i][j]+answer[i-1][j];
}else if (j==i){
answer[i][j]=
triangle[i][j]+answer[i-1][j-1];
}else{
answer[i][j]=
triangle[i][j]+
max(answer[i-1][j-1],answer[i-1][j]);
}
if (answer[i][j]>maxtotal){
maxtotal=answer[i][j];
}
}
}
printf("%d\n",maxtotal);
return 0;
}
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