Compilare: main.cpp:35:10: warning: extra tokens at end of #undef directive #undef TR(x) # ^ main.cpp: In function 'int main()': main.cpp:20:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d\n", &n) ; ^ main.cpp:25:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &cost[i][j]) ; } } ^