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49 lines (48 loc) · 11.4 KB
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//https://leetcode.com/problems/triangle
class Solution {
public:
int minimumTotal(vector<vector<int>>& triangle) {
vector<int> dp(triangle.size(), INT_MAX);
dp[0] = triangle[0][0];
int val = INT_MAX;
for(int r=1; r<triangle.size(); r++){
for(int c=triangle[r].size() - 1; c > 0; c--){
dp[c] = min(dp[c], dp[c-1]) + triangle[r][c];
if(r == triangle.size()-1)
val = min(val, dp[c]);
}
dp[0] = dp[0] + triangle[r][0];
if(r == triangle.size()-1)
val = min(val, dp[0]);
}
return val == INT_MAX? dp[0]: val;
}
};
class Solution {
public:
int minimumTotal(vector<vector<int>>& triangle) {
vector<vector<int>> dp(triangle.size(), vector<int>(triangle.size(), INT_MAX));
dp[0][0] = triangle[0][0];
for(int r=0; r<triangle.size()-1; r++){
for(int c=0; c<triangle[r].size(); c++){
dp[r+1][c] = min(dp[r+1][c], dp[r][c]+triangle[r+1][c]);
dp[r+1][c+1] = min(dp[r+1][c+1], dp[r][c]+triangle[r+1][c+1]);
}
}
int val = INT_MAX;
for(int c=0; c<triangle[triangle.size()-1].size(); c++){
val = min(val, dp[triangle.size()-1][c]);
}
return val;
}
};
/*
[[-1],[2,3],[1,-1,-3]]
[[2],[3,4],[6,5,7],[4,1,8,3]]
[[-10]]
[[0]]
[[0], [0, 0]]
[[2],[-3,4],[100,99,7],[4,1,-8,3]]
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