CodeForces 989C

题意略。

思路：如图

详见代码：

#include<bits/stdc++.h>
#define maxn 55
using namespace std;

char board[maxn][maxn];

void init(){
    for(int i = ;i <= ;++i){
        for(int j = ;j <= ;++j){
            board[i][j] = 'A';
        }
    }
    for(int i = ;i <= ;++i){
        for(int j = ;j <= ;++j){
            board[i][j] = 'B';
        }
    }
    for(int i = ;i <= ;++i){
        for(int j = ;j <= ;++j){
            board[i][j] = 'C';
        }
    }
    for(int i = ;i <= ;++i){
        for(int j = ;j <= ;++j){
            board[i][j] = 'D';
        }
    }
}

int main(){
    init();
    int a,b,c,d;
    scanf("%d%d%d%d",&a,&b,&c,&d);
    --a,--b,--c,--d;
    for(int i = ;i <= ;i += ){
        if(a == ) break;
        for(int j = ;j <= ;j += ){
            if(a == ) break;
            board[i][j] = 'A';
            --a;
        }
    }
    for(int i = ;i <= ;i += ){
        if(b == ) break;
        for(int j = ;j <= ;j += ){
            if(b == ) break;
            board[i][j] = 'B';
            --b;
        }
    }
    for(int i = ;i <= ;i += ){
        if(c == ) break;
        for(int j = ;j <= ;j += ){
            if(c == ) break;
            board[i][j] = 'C';
            --c;
        }
    }
    for(int i = ;i <= ;i += ){
        if(d == ) break;
        for(int j = ;j <= ;j += ){
            if(d == ) break;
            board[i][j] = 'D';
            --d;
        }
    }
    printf("50 50\n");
    for(int i = ;i <= ;++i){
        for(int j = ;j <= ;++j){
            printf("%c",board[i][j]);
        }
        printf("\n");
    }

    return ;
}