tren3.c:15: warning: built-in function `index' declared as non-function tren3.c: In function `load_data_and_find_diff': tren3.c:86: warning: `mini' might be used uninitialized in this function tren3.c:86: warning: `maxi' might be used uninitialized in this function tren3.c: In function `solve': tren3.c:118: warning: suggest parentheses around assignment used as truth value tren3.c:121: warning: suggest parentheses around assignment used as truth value tren3.c:128: warning: suggest parentheses around assignment used as truth value tren3.c:131: warning: suggest parentheses around assignment used as truth value tren3.c:138: warning: suggest parentheses around assignment used as truth value tren3.c:141: warning: suggest parentheses around assignment used as truth value tren3.c:145: warning: suggest parentheses around assignment used as truth value tren3.c:151: warning: suggest parentheses around assignment used as truth value tren3.c:157: warning: suggest parentheses around assignment used as truth value tren3.c:161: warning: suggest parentheses around assignment used as truth value tren3.c:167: warning: suggest parentheses around assignment used as truth value tren3.c:171: warning: suggest parentheses around assignment used as truth value