Compilare: user.cpp: In function ‘int main()’: user.cpp:112:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp:120:9: warning: unused variable ‘k’ [-Wunused-variable] int k = 1; ^ user.cpp:116:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &N); ^ user.cpp:118:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[i]); ^ user.cpp:121:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &M); ^ user.cpp:123:47: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d %d", &type, &a, &b); ^