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LeetCode, GeeksForGeeks Problem of the day solution

LeetCode, GeeksForGeeks Problem of the day solution

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Complete daily challenges from LeetCode, GeeksForGeeks and redeem their rewards Channel link : https://t.me/leetcode_gfg_potd

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GFG | Problem of the day :

class Solution { public: string destCity(vector>& paths) { unordered_mapa; for(int i=0;i

LeetCode | Daily challenge :

class Solution{ public: int dp[100005]; const int M = 1e9+7; int nthPoint(int n){ if(dp[0]==0){ for(int i=0;i<100005;i++){ dp[i]=-1; } } if(n==0 || n==1) return 1; if(dp[n]!=-1) return dp[n]; return dp[n]=(nthPoint(n-1)%M+nthPoint(n-2)%M)%M; } };

GFG | Problem of the day :

class Solution { public: vector> onesMinusZeros(vector>& grid) { vector row(grid.size()); vector col(grid[0].size()); for(int i = 0; i < grid.size(); ++i){ for(int j = 0; j < grid[0].size(); ++j){ row[i] += grid[i][j]; col[j] += grid[i][j]; } } for(int i = 0; i < grid.size(); ++i){ for(int j = 0; j < grid[0].size(); ++j){ grid[i][j] = row[i] + col[j] - (grid.size()-row[i]) - (grid[0].size()-col[j]); } } return grid; } };

LeetCode | Daily challenge :

class Solution{ public: long long M=1e9+7; long long countWays(int n, int k){ if(n==1)return k; long long prev=0,curr=k; long long ans = prev+curr; for(int i=2;i<=n;i++){ prev=curr; curr=(ans*(k-1))%M; ans=prev+curr; } return ans%M; } };

GFG | Problem of the day :

class Solution { public: int numSpecial(vector>& mat) { int m = mat.size(); int n = mat[0].size(); vector rowOne(m), colOne(n); for(int i = 0; i < m; i++) { rowOne[i] = accumulate(mat[i].begin(), mat[i].end(), 0); for(int j = 0; j < n; j++) { colOne[j] += mat[i][j]; } } int ans = 0; for(int i = 0; i < m; i++) { for(int j = 0; j < n; j++) { ans += mat[i][j] == 1 && rowOne[i] == 1 && colOne[j] == 1; } } return ans; } };

LeetCode | Daily challenge :

class Solution{ public: // #define ll long long ll countStrings(int n) { vector<int>ones(n+1,0),zeros(n+1,0); int mod = 1e9 +7; ones[0]=1;ones[1]=1; zeros[0]=1;zeros[1]=2; for(int i=2;i<n;i++) { ones[i]=(ones[i-1]+ones[i-2])%mod; zeros[i]=(zeros[i-1]+zeros[i-2])%mod; } return (ones[n-1]+zeros[n-1])%mod; } };

GFG | Problem of the day :

class Solution { public: int maxProduct(vector& nums) { int m1 = 1; int m2 = 1; for(auto n : nums) { if(n>=m1) { if (n >= m2) swap (n ,m2); m1 = n; } } return(m1-1)*(m2-1); } };

LeetCode | Daily challenge :

class Solution{ public: int maxGold(int n, int m, vector> M) { vector> dp(n, vector(m, 0)); for (int i = 0; i < n; i++) { dp[i][0] = M[i][0]; } int ans = 0; for (int j = 1; j < m; j++) { for (int i = 0; i < n; i++) { int sum = 0, sum1 = 0, sum2 = 0; if (i > 0) { sum = dp[i - 1][j - 1]; } sum1 = dp[i][j - 1]; if (i < n - 1) { sum2 = dp[i + 1][j - 1]; } dp[i][j] = M[i][j] + max(sum, max(sum1, sum2)); ans = max(ans, dp[i][j]); } } return ans; } };

GFG | Problem of the day :

class Solution { public: int findSpecialInteger(vector& aa) { mapmp; int m=aa.size(); int mx=0,a; for(int i=0;im/4) { // a=it.second; mx=max(mx,it.first); } } cout<

LeetCode | Daily challenge :

class Solution{ public: long maximumSumSubarray(int K, vector &Arr , int N){ long maxi = 0; long sum = 0; int i=0; int j=0; while(j