如何查找具有最大值的多维数组的索引

Question

我有此代码示例来查找最大使用天数，它的工作方式与魅力一样。但我需要得到哪个array index具有最大值。我尝试了很多方法，但无法提出解决方案。这是我曾尝试：

#include<stdio.h> 
int main(){ 
    float maximumDayUsage=0,minimumDayDayUsage=0; 
    int whichDayHasMaximumUsage; 
    float usage[7][5]={ {1.2, 2.1, 0.8, 0.0, 4.1}, 
         {1.0, 1.3, 4.0, 1.5, 7.8}, 
         {3.2, 1.0, 1.3, 4.0, 9.5}, 
         {1.5, 3.2, 2.3, 0.4, 7.4}, 
         {1.2, 2.1, 0.8, 0.0, 4.1}, 
         {2.6, 2.1, 1.7, 7.0, 13.4}, 
         {1.2, 2.1, 0.8, 0.0, 4.1} }; 
    for(int i=0;i<7;i++){ 
     for(int j=0;j<5;j++){ 
      if(usage[i][j]>maximumDayUsage){ 
       maximumDayUsage=usage[i][j]; 
       whichDayHasMaximumUsage++; 
      }else{ 

      } 
     } 
    } 
    printf("Usage: %.2f\n",maximumDayUsage); 
    printf("Which Day: %d",whichDayHasMaximumUsage); 
    return 0; 
} 

Answer 1

只需保存最大使用量一天i和j指标，当你迭代这个数组：

int max_i = 0; 
int max_j = 0; 
float maximumDayUsage = 0; 
for(int i=0;i<7;i++){ 
    for(int j=0;j<5;j++){ 
     if(usage[i][j] > maximumDayUsage) { 
      maximumDayUsage = usage[i][j]; 
      max_i = i; 
      max_j = j; 
     } 
    } 
}