Compilare: main.cpp: In function 'int main()': main.cpp:50:9: warning: unused variable 'ii' [-Wunused-variable] int ii, jj ; ^~ main.cpp:50:13: warning: unused variable 'jj' [-Wunused-variable] int ii, jj ; ^~ main.cpp:43:42: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d %d\n", &v, &n, &m) ; ^ main.cpp:131:12: warning: 'col' may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(out, "%d %d\n%c", posI, posJ, col) ; ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~