Codeforces Round #419 C

C. Karen and Game

题意:给你一个矩阵,有2种操作,1是将某一行全部减1,2 是将某一列全部减1,问你最少多少次操作可以使得矩阵全部为0,并输出每次的操作,如果不可能,输出-1

思路:判断行和列的大小,如果行数大于列数,则优先进行操作1,否则优先进行操作2,将每次操作存入字符串,最后判断是否全部为0,xjb模拟就是了

AC代码:

#include "iostream"
#include "string.h"
#include "stack"
#include "queue"
#include "string"
#include "vector"
#include "set"
#include "map"
#include "algorithm"
#include "stdio.h"
#include "math.h"
#define bug(x) cout<<x<<" "<<"UUUUU"<<endl;
#define mem(a) memset(a,0,sizeof(a))
using namespace std;
const int N=2e5+100;
int n,m,g[105][105],ans,l[105],r[105],ll=1;
char anss[350005];
int  main(){
    cin>>n>>m;
    memset(l,111,sizeof(l));
    memset(r,111,sizeof(r));
    for(int i=1; i<=n; ++i){
        for(int j=1; j<=m; ++j){
            scanf("%d",&g[i][j]);
            l[i]=min(l[i],g[i][j]);
        }
    }
    if(m>=n){
        for(int i=1; i<=n; ++i){
            for(int k=1; k<=l[i]; ++k){
                ans++;
                anss[ll++]='r',anss[ll++]='o',anss[ll++]='w',anss[ll++]=' ',anss[ll++]=i,anss[ll++]='\n';
            }
            for(int j=1; j<=m; ++j){
                g[i][j]-=l[i];
            }
        }
        for(int j=1; j<=m; ++j){
            for(int i=1; i<=n; ++i){
                r[j]=min(r[j],g[i][j]);
            }
        }
        for(int j=1; j<=m; ++j){
            for(int k=1; k<=r[j]; ++k){
                ans++;
                anss[ll++]='c',anss[ll++]='o',anss[ll++]='l',anss[ll++]=' ',anss[ll++]=j,anss[ll++]='\n';
            }
            for(int i=1; i<=n; ++i){
                g[i][j]-=r[j];
            }
        }
    }
    else{
        for(int j=1; j<=m; ++j){
            for(int i=1; i<=n; ++i){
                r[j]=min(r[j],g[i][j]);
            }
        }
         for(int j=1; j<=m; ++j){
            for(int k=1; k<=r[j]; ++k){
                ans++;
                anss[ll++]='c',anss[ll++]='o',anss[ll++]='l',anss[ll++]=' ',anss[ll++]=j,anss[ll++]='\n';
            }
            for(int i=1; i<=n; ++i){
                g[i][j]-=r[j];
            }
        }
        for(int i=1; i<=n; ++i){
            for(int j=1; j<=m; ++j){
                l[i]=min(l[i],g[i][j]);
            }
        }
        for(int i=1; i<=n; ++i){
            for(int k=1; k<=l[i]; ++k){
                ans++;
                anss[ll++]='r',anss[ll++]='o',anss[ll++]='w',anss[ll++]=' ',anss[ll++]=i,anss[ll++]='\n';
            }
            for(int j=1; j<=m; ++j){
                g[i][j]-=l[i];
            }
        }
    }
    for(int i=1; i<=n; ++i){
        for(int j=1; j<=m; ++j){
            if(g[i][j]>0){
                cout<<"-1";
                return 0;
            }
        }
    }
    anss[ll]='\0';
        cout<<ans<<endl;
    for(int i=0; i<ans; ++i){
        for(int j=1; j<=4; ++j){
            printf("%c",anss[i*6+j]);
        }
        int kk=anss[i*6+5];
        printf("%d%c",kk,anss[i*6+6]);
    }
    return 0;
}

 

posted on 2017-06-28 22:06  lazzzy  阅读(165)  评论(0编辑  收藏  举报

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