LeetCode, GeeksForGeeks Problem of the day solution
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class Solution {
public:
string destCity(vector>& paths) {
unordered_mapa;
for(int i=0;i
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;
}
};
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;
}
};
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;
}
};
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;
}
};
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;
}
};
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);
}
};
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;
}
};
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<
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
