A题

#include<bits/stdc++.h>
using namespace std;
int e[10001];
int main(){
    int s1,s2,s3,q=e[3],w;
    cin>>s1>>s2>>s3;
    for(int i=1;i<=s1;i++){
        for(int j=1;j<=s2;j++){
            for(int k=1;k<=s3;k++){
                e[i+j+k]++;
    }
        }
            }
    for(int i=3;i<=s1+s2+s3;i++){
        if(e[i]>q){
            q=e[i];
            w=i;
        }
    }
    cout<<w;

}




B题

#include<bits/stdc++.h>
using namespace std;

int n,a[25][25];

int main(){
	cin>>n;
	for(int i=0;i<n;i++){
		a[i][0]=1;
		a[i][i]=1;
		for(int j=1;j<i;j++){
			a[i][j]=a[i-1][j-1]+a[i-1][j];
		}
	}
	for(int i=0;i<n;i++){
		for(int j=0;j<=i;j++){
			cout<<a[i][j]<<" ";
		}
		cout<<endl;
	}
	return 0;
} 

C题

#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,s[10][10],sum=0,j=0;
	int a[10][10] = {0};
	int dx[] = {0,1,0,-1};
	int dy[] = {1,0,-1,0};
	int dir = 0;
	int x = 0, y = -1;
	cin >> n;
	for(int i=1;i<=n*n;i++){
		int nx = x + dx[dir];
		int ny = y + dy[dir];
		if (nx >= n || ny >= n || nx < 0 || ny < 0 || a[nx][ny] != 0) {
			dir = (dir + 1) % 4;
			nx = x + dx[dir];
			ny = y + dy[dir];
		}
		
		
		a[nx][ny] = i;
		x = nx, y = ny;
	}
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			cout << setw(3) << a[i][j];
		}
		cout << '\n';
	} 
}


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