Compilare: main.cpp: In function 'int main()': main.cpp:25:10: warning: unused variable 'm' [-Wunused-variable] int n, m, k; ^ main.cpp:25:13: warning: unused variable 'k' [-Wunused-variable] int n, m, k; ^ main.cpp:26:7: warning: unused variable 'a' [-Wunused-variable] int a, b; ^ main.cpp:26:10: warning: unused variable 'b' [-Wunused-variable] int a, b; ^ main.cpp:29:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ main.cpp:33:41: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &distance[i][j]); ^