Compilare: main.cpp: In function 'int main()': main.cpp:28:24: warning: unused variable 'nr' [-Wunused-variable] int v, st, dr, i, j, nr, l, c; ^~ main.cpp:28:28: warning: unused variable 'l' [-Wunused-variable] int v, st, dr, i, j, nr, l, c; ^ main.cpp:28:31: warning: unused variable 'c' [-Wunused-variable] int v, st, dr, i, j, nr, l, c; ^ main.cpp:31:46: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d%d%d", &v, &n, &st, &dr ); ^ main.cpp:34:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &s[i][j] ); ^