Compilare: user.cpp: In function ‘int main()’: user.cpp:107:57: warning: use of ‘ll’ length modifier with ‘f’ type character [-Wformat=] fprintf(we, "%.10llf", (mg[i][0] / mg[i][1])); ^ user.cpp:36:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(re, "%d%d", &n, &m); ^ user.cpp:41:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(re, "%d%d%d", &a, &b, &c); ^ user.cpp:74:21: warning: ‘baz’ may be used uninitialized in this function [-Wmaybe-uninitialized] viz[baz] = 1; ^